anonymous one year ago I need help with a few Algebra 1 Q's in preparation for a test. It will take about 10 mins of your time, and I will fan, medal, and give a positive testimonial to anyone who is willing to help me out.

1. anonymous

i will try my best :)

2. anonymous

Thank you! Give me a few seconds.

3. anonymous

ok

4. anonymous
5. anonymous

If you don't know it, it's fine, we can move on if you'd like :)

6. anonymous

I'm in algebra 2 as of now and I'm not sure of the answer lol

7. anonymous

Okay! No problem. (I'm in Algebra 1) Let me get out the next Q.

8. anonymous

k

9. anonymous
10. anonymous

It would be A. you want an explanation?

11. anonymous

12. anonymous

ok so the shaded part of the graph would all be correct answers

13. anonymous

and A is the only ordered pairs within the shaded part

14. anonymous

Oh okay, so by trial and error, one can get the correct answer easily. Thank you!

15. anonymous

np

16. anonymous

Q.3: http://prntscr.com/7a1r4w Are they asking for the rate of change?

17. anonymous

I don't think so

18. anonymous

im pretty sure its C.

19. anonymous

Why is that?

20. anonymous

because when i plugged in the numbers into the equation they equaled eachother

21. anonymous

5 is plugged into h(5) =

22. anonymous

That's a great way to solve this one! so if I plugged in 0 for x, I would get 5/1 = 5 and if h(x) = 5, then the equation is true. Thanks

23. anonymous

and 0 is plugged into x

24. anonymous

yep :)

25. anonymous

http://prntscr.com/7a1ssa I was thinking it's either the peak or the left part

26. anonymous

(Those are the only parts that make the function non-linear)

27. anonymous

So it's either A or B

28. anonymous

But then C also describes the peak

29. anonymous

huh

30. anonymous

or no sorry not C

31. anonymous

Precisely... but they're asking for an interval, so it can't be C

32. anonymous

Ya its a or b im not sure which one

33. anonymous

I think it's A mainly because the function would have been in a triangle shape if not for the discontinuation of the left part.

34. anonymous

ya i was just about to say that as well

35. anonymous

i would go with A

36. anonymous

Okay! http://prntscr.com/7a1uuj (Let me know when you're sick of answering my Q's) :)

37. anonymous

so 24 = x/3

38. anonymous

then you would do inverse operations

39. anonymous

and get x = 72

40. anonymous

Okay, like cross-multiplication. So it would be 24 * 3 and x * 1?

41. anonymous

ya that would work too

42. anonymous

72/x?

43. anonymous

it would be 24 * 3 = x * 1

44. anonymous

So 72 = x! Meaning answer is D?

45. anonymous

you forgot the equal sign

46. anonymous

yep

47. anonymous

What is the pattern of this sequence? http://prntscr.com/7a1wqe

48. anonymous

Do you have any ideas what the pattern might be?

49. anonymous

Yes: from -2 to 3 it goes through an interval of 3. From 3 to 1 it's 2, from 1 to 4 it's 3, from 4 to 5 it's 1 and from 5 to 9 it's 4. I don't see an ongoing pattern.

50. anonymous

yeah im not sure on this one sorry:(

51. anonymous

No problem! :) Next one: http://prntscr.com/7a1z2r

52. anonymous

I think it's A.

53. anonymous

Yes it is :)

54. anonymous

(5, 40) because x represents hours (independent value) it's all about interpreting the graph into a real world problem.

55. anonymous

http://prntscr.com/7a1zt7 Disregard the answer I chose, it was by accident.

56. anonymous

Yep and might I say u seem really smart btw you type lol

57. anonymous

so your in like AP algebra 1 im guessing?

58. anonymous

There isn't an AP Alg 1.. is there? I'm in honors

59. anonymous

there is in some schools but I think its A but im not sure

60. anonymous

I understand :)

61. anonymous

Next question? or are we still on this one?

62. anonymous

I believe that the answer to the one I just asked is either A or B

63. anonymous

Oh it's above :)

64. anonymous

Now that I look at it more I dont think its A because its saying its greater than or equal to 24,000 when it should be it's less than or equal to 24,000 right?

65. anonymous

And B would eventually exceed 24,000 if im not mistaken

66. anonymous

Since the value of the car is a decreasing exponential function, I agree with your points.

67. anonymous

I think it is C. actually

68. anonymous

But wouldn't the 'y' represent range instead of domain?

69. anonymous

thats also what i was thinking as well but its the only one that makes sense i think

70. anonymous

or no cause its also greater than or equal to

71. anonymous

either there's a mistake with the question or we are missing something lol

72. anonymous

Hmm.. you're right. Perhaps this Q doesn't have a correct answer at all. There are a couple of other Q's on this homework that are inaccurate, too.

73. anonymous

oh ok then that must be it

74. anonymous

75. anonymous

Ya its C

76. anonymous

since its asking for the Y values (or range values)

77. anonymous

This was such an easy question. I guess the concept of domain and range to me isn't very clear but I understand now. (Silly me)

78. anonymous

lol

79. anonymous

:P

80. anonymous

http://prntscr.com/7a2796 http://prntscr.com/7a27c5 (It wouldn't fit into my screen)

81. anonymous

Its A. since it said constant rate that means it has to be a straight line and also it has the ordered pair (5, 300) :)

82. anonymous

Right. It's linear.

83. anonymous

yep

84. anonymous

Are you still willing to help? I know that your time is precious.

85. anonymous

Yes I am still willing to help i just do my homework while helping others :)

86. anonymous

I should try that strategy, too. Just know that even though we don't know each other, I can tell you're very kind-hearted taking the time out of your day to serve others for nothing much in return. It's truly appreciated.

87. anonymous

Thank you for that and no problem :)

88. anonymous

With that said.. http://prntscr.com/7a28mg

89. anonymous

It is A.

90. anonymous

Because the x-intercept is when y = 0, right?

91. anonymous

And vice versa for the y-intercept.

92. anonymous

yes thats correct

93. anonymous

Or its B sorry

94. anonymous

I'm pretty sure this is correct, but just in case I wanted to check it with you. And why would it be B?

95. anonymous

because when you set y equal to zero then that goes away leaving you with x = 12

96. anonymous

because -6(0) = 0

97. anonymous

Right. Sorry I didn't see that error either.

98. anonymous
99. anonymous

I'm not sure what zero of this function means?

100. anonymous

It means when y is set to zero

101. anonymous

Also known as the x-intercept

102. anonymous

oh ok

103. anonymous

So its D then right?

104. anonymous

I got the answer by looking at the graph, but it shouldn't be that easy. The f(x) = x/2 - 4 is also throwing me off a bit

105. anonymous

well the equation f(x) = 1/2x -4

106. anonymous

When x = 0 the y is -4

107. anonymous

and if y = 0 then x = 8

108. anonymous

Horrible homework makers

109. anonymous

but im pretty sure its asking for the x-intercept

110. anonymous

http://prntscr.com/7a2e21 You're right

111. anonymous

They're asking for the x-intercept. So it would be D.

112. anonymous

Ya ok

113. anonymous
114. anonymous

4 would work

115. anonymous

Since it's absolute value, the answer would ultimately be positive,

116. anonymous

Yeah

117. anonymous

but 20/3 would not since it would make a decimal

118. anonymous

You're right.. again! It can't be the other options either

119. anonymous

and the other numbers are way to big

120. anonymous

121. anonymous

122. anonymous

yeah you definitely should :P

123. anonymous
124. anonymous

I have very few left

125. anonymous

I could graph this one OR calculate its vertex and ultimately maximum point.

126. anonymous

Ya either one of those methods would work i would prefer calculating to find the maximum point just saying

127. anonymous

Yeah, we won't always have access to graphing calculators on the exam.

128. anonymous

because your not allowed or you just dont have one?

129. anonymous

So vertex formula is: x = b/2a, right?

130. anonymous

Or maybe I mixed it up

131. anonymous

its -b isnt it?

132. anonymous

Right! -b/2a = x

133. anonymous

b = 300 and a = 5

134. anonymous

-(300)/2(5) = -300/10

135. anonymous

= -30

136. anonymous

Hmm... answer choices don't match up

137. anonymous

it would be 300/10 wouldnt it?

138. anonymous

not negative

139. anonymous

No it's negative because of the "-b"

140. anonymous

for the x side

141. anonymous

and its also a negative 5 so

142. anonymous

it would end up being 30 = 30

143. anonymous

if im not mistaken

144. anonymous

Okay so it's official that I'm stupid. Thank you for pointing the negative sign of the 5. I didn't see it. So the answer is B = \$30.

145. anonymous

yes lol

146. anonymous

147. anonymous

honestly

148. anonymous

http://prntscr.com/7a2ley I don't think so.. math is one of my weaker subjects haha

149. anonymous

The formula for exponential increase is: f(x) = Initial Value(Rate)^x

150. anonymous

ok so

151. anonymous

But I also recall a (1 + r) rate to an exponential function

152. anonymous

http://prntscr.com/7a2mow <--- This is just a picture. I think that I learned this back in 7th grade about interest, so I believe that my answer is correct.

153. anonymous

the r is if there is an interest rate

154. anonymous

or no disregard that statement lol

155. anonymous

Ah, okay. So what are your thoughts?

156. anonymous

I think its C and ill explain

157. anonymous

Okay

158. anonymous

.22 is 22% but 1.22 would be 120% and you would want 120% because it would take the initial population and add the 22% to it as just 22% would only complete half of the problem. do you undersatnd?

159. anonymous

sorry if i didnt explain that well enough lol

160. anonymous

Yes, I completely understand where you're coming from. But wouldn't 120% of a growth be too much of a population growth? In a real-world scale, it's not very probable, but then again, in math anything is possible in the real world lol

161. anonymous

oh your completely right since A (the initial population) is already in the equation.

162. anonymous

163. anonymous

So yes its A

164. anonymous

Yes! I outsmarted the wise one

165. anonymous

:) Jk jk

166. anonymous

haha

167. anonymous

all good

168. anonymous

trust me its not too hard to outsmart me at times :P

169. anonymous

http://prntscr.com/7a2r8m I doubt it!

170. anonymous

is D. y = 88x? or is it just y - 88x? lol

171. anonymous

D. is y = 88x

172. anonymous

ok

173. anonymous

I think what they're doing is the simplified version of 40/880

174. anonymous

So It would most likely be B

175. anonymous

Yes that is correct

176. anonymous

i wouldn't to try and outsmart you if math is your weaker subject :P

177. anonymous

|dw:1432751159345:dw|

178. anonymous

It's A

179. anonymous

you mean divided by 20 right?

180. anonymous

No, by 2… it's kinda how I simplify fractions in my head

181. anonymous

I cancelled out the zeroes

182. anonymous

oh yes i understand ok lol see i told you its not to hard to outsmart me :P

183. anonymous

|dw:1432751466669:dw|

184. anonymous

185. anonymous

for sake of me learning now lol why is the 40 the numerator and not the 880?

186. anonymous

you dont have to explain if you dont want to :P

187. anonymous

Oh pretend that it's not a fraction.. I just divided both numerator and denominator by 40.

188. anonymous

I usually write it that way, but in my prior drawing, I wrote it by adding in small 2's so you wouldn't get confused, sorry, my mistake haha

189. anonymous

no i understand that but for the equation why is it 40/880 and not 880/40

190. anonymous

Oh! It was the most logical way to go in my opinion. But you bring up a valid point.. or else it would've been 22/1.

191. anonymous

ya

192. anonymous

im not sure which way it should be set up

193. anonymous

Hours is an independent value. Time is always an independent variable. x ALWAYS represents independent values because the y is dependent. Does that make sense? Since Mrs. Marez worked for 40 hours, then 40 would represent x. Usually it's x/y, because it represents the relationship between both x and y. However, the rate of change is: y2 - y1 / x2 - x1

194. anonymous

In other words, it's y/x… so now I'm truly split between this

195. anonymous

I believe that the relationship refers to slope.

196. anonymous

ok so lets just say the answer is y = 22x. it says last week she earned \$880 and its asking for her weekly earnings. so if we multiplied 22 by 40 that would equal her weekly income of \$880. now if we multiplied 1/22 by 40 that would be 1.8

197. anonymous

So im pretty sure it is B now lol

198. anonymous

does that make sense?

199. anonymous

Definitely. (See, you outsmarted me again)

200. anonymous
201. anonymous

hahaha that seemed harder than it should have been

202. anonymous

Another sequence problem ^^

203. anonymous

right lol

204. anonymous

i would guess B

205. anonymous

I would guess either C or D because B would be the 6th value.. not the 8th

206. anonymous

but im not exactly sure what the pattern is

207. anonymous

so u think the fractions are multiplying by 2?

208. anonymous

|dw:1432752458487:dw|

209. anonymous

The last three have a pattern and the first two have a separate pattern

210. anonymous

i saw that as well

211. anonymous

so D then correct?

212. anonymous

I think D is the answer

213. anonymous

ya and the numerator is multiplying by 2

214. anonymous

Brb for 5 mins

215. anonymous

ok

216. anonymous

just tag me in the chat when you're back :)

217. anonymous

I sincerely apologize @Chumpian my internet connection was reset

218. anonymous

I have 5 or 6 Q's left if you're up for it

219. anonymous

im up for it :)

220. anonymous

Thank you! http://prntscr.com/7a3hj7

221. anonymous

Please disregard the answer I chose.. it's a random guess as I didn't look at the Q

222. anonymous

It's C right?

223. anonymous

Ya it's C

224. anonymous

Let me check

225. anonymous

Yup! It's C.

226. anonymous

http://prntscr.com/7a3kpt I put the #'s in order

227. anonymous

School A: 1300, 1350, 1350, 1370, 1400 School B: 1300, 1350, 1375, 1400, 1410

228. anonymous

C is correct for the first part

229. anonymous

I think #45 and #46 are separate Q's and aren't two part Q's

230. anonymous

ok i thought so as well

231. anonymous

Is #46 D?

232. anonymous

I'm not sure

233. anonymous

Wait no it says least likely to be a normal distribution, so it's either A or B

234. anonymous

It would be B then right?

235. anonymous

How old are you just curious?

236. anonymous

Not sure because it can't be a normal distribution if they're asking for 14-year old girls outside New York.. meaning everywhere around the world.

237. anonymous

238. anonymous

classes*

239. anonymous

:0

240. anonymous

im embarrassed now lol

241. anonymous

Why? No need to be but how old are you?

242. anonymous

I'm 16

243. anonymous

Most of my friends are 15+ haha

244. anonymous

and your just as smart if not smarter than i am lol

245. anonymous

I don't think so… you have more experiences being older than I am. Although you may be in Alg 2 (assuming you're in 10th/11th grade) you still take other courses that are totally not equivalent to an 8th graders'.

246. anonymous

true true but back to the Q im not sure what it is :(

247. anonymous

It's fine! I put in A. http://prntscr.com/7a3qw7 Last question and you're free of me! :)

248. anonymous

It would be D :)

249. anonymous

Yup! Just checked. Thank you so, so much.

250. anonymous

np ;)

251. anonymous

Just tag or message me if im on if you want any help

252. anonymous

I'll let you know what I get in about 10-15 mins (only if you want to) as I do the other Q's :) Have a great rest of the day!

253. anonymous

ok you too :)