Stormswan
  • Stormswan
can someone check my answers please?? C: I will give a medal!
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Stormswan
  • Stormswan
A segment with endpoints A (2, 1) and C (4, 7) is partitioned by a point B such that AB and BC form a 3:2 ratio. Find B. (3.2, 1.6) (3.2, 4.6) (3.8, 3.4) (4.4, 5.8)
Stormswan
  • Stormswan
I think the answer is B
Stormswan
  • Stormswan
Find the perimeter of a quadrilateral with vertices at C (−2, 1), D (2, 4), E (5, 0), and F (1, −3). Round your answer to the nearest hundredth when necessary. 12 units 16 units 20 units 24 units

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Stormswan
  • Stormswan
and im not sure on this one... but i think its C?
Stormswan
  • Stormswan
that's for #2??
anonymous
  • anonymous
for the first one the change in x is 2 and the change in y is 7 we can find the distance by r^2= x^2 + 7^2
Stormswan
  • Stormswan
okay, could you explain how to do this please? I really need to learn this because I have a bad grade in the class and I need to catch up.
Stormswan
  • Stormswan
you know what? i dont need help with those anymore... but i need help with a few others, if anyone is willing to help??
Stormswan
  • Stormswan
A cylinder has a radius of 6 feet and a height of 9 feet. Which of the following can be used to calculate the volume of a cone that fits exactly inside the cylinder? 1 over 3(3.14)(92)(6) (3.14)(92)(6) 1 over 3(3.14)(62)(9) (3.14)(62)(9)
Stormswan
  • Stormswan
this is the question.
freckles
  • freckles
|dw:1437893489289:dw|
freckles
  • freckles
my drawing got cut off
Stormswan
  • Stormswan
aw, okay. what did it say??
freckles
  • freckles
basically I was saying you can use the slope of that line along with AB/BC=3/2 to solve for B \[\frac{\sqrt{(x-2)^2+(y-1)^2}}{\sqrt{(x-4)^2+(y-7)^2}}=\frac{3}{2} \\ \text{ and use } \frac{y-1}{x-2}=\frac{y-7}{x-4}=\frac{7-1}{4-2}\] \[\sqrt{\frac{(x-2)^2+(y-1)^2}{(x-4)^2+(y-7)^2}}=\frac{3}{2} \\ \text{ \square both sides } \\ \frac{(x-2)^2+(y-1)^2}{(x-4)^2+(y-7)^2}=\frac{9}{4} \\ \text{ use the slope thing } y-1=\frac{6}{2}(x-2) \text{ which simplifying a bit gives }\\ y-1=3(x-2) \\ \text{ also we have from the slope thing that } y-7=3(x-4) \\ \\ \text{ so now we have the equation } \\ \frac{(x-2)^2+9(x-2)^2}{(x-4)^2+9(x-4)^2} =\frac{9}{4} \\ \text{ combine like terms on \top and bottom } \\ \frac{10(x-2)^2}{10(x-4)^2}=\frac{9}{4} \\ \text{ remember } \frac{10}{10}=1 \\ \frac{(x-2)^2}{(x-4)^2}=\frac{9}{4} \\ (\frac{x-2}{x-4})^2=\frac{9}{4} \\ \text{ this should be pretty easy \to solve from here }\]
freckles
  • freckles
once you solve that equation for x you can use y=3(x-2)+1 to find y by pluggin in that x
freckles
  • freckles
for the perimeter question I would use the distance formula 4 times once for each side and then add up all those side measurements
Stormswan
  • Stormswan
is C right?
freckles
  • freckles
for which one?
Stormswan
  • Stormswan
ummm im talking about the question i just recently asked... not the ones before.
freckles
  • freckles
oh the volume of a cone is pi*r^2*h/3 you are given h is 9 and r is 6 just plug them in
Stormswan
  • Stormswan
so it's D.
freckles
  • freckles
it is none of them have no idea where they get 62 or 92
freckles
  • freckles
perhaps they meant 6^2 or 9^2 or something but as the choices stand none of them are correct
Stormswan
  • Stormswan
what. this is confusing. this is a practice worksheet.. so it doesnt actually count as a part of my grade.. but i'm trying to find out how to do these so that I can get a good grade on the real assignments..
Stormswan
  • Stormswan
okay.... then how about another question....
freckles
  • freckles
so it really is written as 62 or 92?
Stormswan
  • Stormswan
yeah.
freckles
  • freckles
not \[6^2 \text{ or } 9^2?\]
Stormswan
  • Stormswan
Pyramid A is a square pyramid with a base side length of 7 inches and a height of 6 inches. Pyramid B has a volume of 3,136 in3. How many times bigger is the volume of pyramid B than pyramid A? 15 32 54 75 So on this i think the answer is.... B
ganeshie8
  • ganeshie8
@Stormswan it would be less confusing if you limit to one question per post
Stormswan
  • Stormswan
oh.
freckles
  • freckles
we can do the question before it just won't exactly match any of your choices
Stormswan
  • Stormswan
after this question i will make a new post deal? :D
Stormswan
  • Stormswan
ummm @freckles no, it's okay. let's try the next one. i think i got that one right :)
freckles
  • freckles
but choice D didn't have a division by 3 in it
Stormswan
  • Stormswan
idk xD i'm just as confused as you are. but i'll just stick with that answer. Can you check if my next question is right? :)
freckles
  • freckles
I didn't do it but if you found it by calculating Volume of B/Volume of A where volume A.. equals.. \[\text{ volume of } A=\frac{ \text{ base length } \cdot \text{ base width } \cdot \text{height }}{3}\] then you did it correct
freckles
  • freckles
like you know base length=base width since the base is a square
freckles
  • freckles
so V of A=(7*7*6)/3 compute this then do volume of B divided by volume of A
Stormswan
  • Stormswan
okay, good! thanks :)
freckles
  • freckles
I assume good means what I just asked you to do confirmed your answer of 32
Stormswan
  • Stormswan
i'll open a new post with another question, if you dont mind helping @freckles but yeah, I figured it out :)
freckles
  • freckles
32 is correct because 3136/98 is 32 where Volume of B =3136 and Volume of A=98
freckles
  • freckles
alright I might come look at it

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