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What exactly is the question?

There's multiple questions, would you like me to type them out for you? I don't mind.

Are there more than the 3 in the link? Or are you just asking if those answers are correct?

There are 5 more questions, 2 bonus questions but i'm not too worried about them.

ok. I didn't see the links to the other questions before

Oh it's alright, you've got it or do I need to type them?

I see them.

so for A, the amplitude was either 40 or 20 from the previous questions, correct?

The amplitude is 20, the answer from B

I didn't have my work pulled up sorry about that, so it's y=20 cos 2pi x?

Wait! I read you wrong, a=20 and b=2pi/the period?

Am I going to need to get this down to one number for the answer to "a=" or will it be an equation?

Or will this be for both a= and b=

oh you're right. They are asking for a and b separately

so a will be -20 and b will be π/6

Does that make sense?

Not sure if the draw option is any use, im new here

We could use this: https://www.desmos.com/calculator

ok

so you want to enter the equation we found above. and set your window to show 1 period at least

so your horizontal axis should be from 0 to 12. and vertical from -20 to 20

y=-20 cos 2pi/12x is the equation I want to put in?

Reduce the 2π/12 to π/6 and use parentheses to avoid ambiguity
y=-20 cos (pi/6)x

Hold up, put everything after cos in ().
y=-20 cos ((pi/6)x)

Have this so far, should I fix it with the ()'s? http://imgur.com/ptftpkN

Yes

If I add the extra parenthesis it makes two lines, like this: http://imgur.com/KM6VOZB

Is that what we want?

yes. If you zoom out you'll see the waves

Yes! alright so that's all that was? we're done graphing?

yes.

oh yeah. I just meant we were done with that question

Alright so F, how do we find the average water levels?

Just the top of the waves?

52 and 12 I believe

you're right

So what can we do with those to find the average? Divide?

Add them and then divide
(52+12)/2 = 22

I have the graph on hand, how do I determine where the times are?

will finding y give the water level?

correct!

not sure how to find it with just x, walk me through it?

so for each one we just plug in the hours and we get the level, for this it's -10?

right

3:45pm is 7 hours, right?

6.5 hrs

19.31?

yes

lol. It is 9. I'm just as pathetic. I have to count it on my fingers

wolfram just gave me the answer as "true", that cant be right

copy your link here

http://www.wolframalpha.com/input/?i=y+%3D+-20+cos+%28%28%CF%80%2F6%29*9%29

Just take out the y= so it will evaluate the expression

0?

yep

Use 7 for y and solve for x.
7 = -20 cos ((π/6)*x)

http://www.wolframalpha.com/input/?i=7+%3D+-20+cos+%28%28%CF%80%2F6%29*x%29?

8.5 hours?

or 7.5

http://www.wolframalpha.com/input/?i=7+%3D+-20+cos+%28%28%CF%80%2F6%29*x%29%2C+0%3Cx%3C12

this is looking like jibberish to me, is it 12? i'm seeing 12 a lot in there

hold up. can we go back to part c for a second?

the 12 hour period, yes

The period is actually 24. (9:15 to 3:15 is only half the period)

ok. yes. massive brain fart

so is H a 12 hour period as well?

yes, so there will be two solutions over the 12 hour period

Do you see x = 8.32 and x = 3.68?

I see them now yep, what do they have to do with it?

that equals 12?

no, they are the x values where the water level is 7

and they helped us determine that it's a 12 hour period in some way I guess?

The other way around. The equation 7 = -20 cos ((π/6)*x) has infinitely many solutions. We used the 12 hour period to restrict the amount of solutions the equation would give us. That's why the 0

got it!

So to find the times for H, add 3.68 hrs and 8.32 hrs to 9:15.

20.115

not sure how to add .___ in time

I thought we were still on H

No this is still H

I was showing you how to add the times.

that makes much more sense, and when you did that you got 12.93, correct? should we round this?

So it's only a 56 minute period?

no

12 hours 56 minutes

12:56 is the time at which the water level is 7

give me a sec.

sure

and 2 high tides

and you can go off that same chart to get both? I'd think so since high and low are both on there

yes you can

No I think that's it :)