anonymous
  • anonymous
Help please ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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AihberKhan
  • AihberKhan
What is your question? @nightcore144
anonymous
  • anonymous
I sent a picture... Let me try again....
AihberKhan
  • AihberKhan
Okay.

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anonymous
  • anonymous
I sent the photo again
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anonymous
  • anonymous
@AihberKhan
tkhunny
  • tkhunny
Show some work of your own, please. You can't have NO idea.
anonymous
  • anonymous
@FortyTheRapper
FortyTheRapper
  • FortyTheRapper
I'll start you off for number 5. So for number 5, what shapes do you see?
anonymous
  • anonymous
A rectangle and a circle.
FortyTheRapper
  • FortyTheRapper
Right on the rectangle part, but the circle is actually cut in half making it a semi-circle, right? Now he wants to find the equation, which requires the areas. Would you know the area of a rectangle?
anonymous
  • anonymous
Area equals bh
FortyTheRapper
  • FortyTheRapper
Right, so do you see the base and height of this rectangle?
anonymous
  • anonymous
the base is 36 in and the height is 60 in
FortyTheRapper
  • FortyTheRapper
Right, so that gives us the (36 * 60) part. So far, all the answer choices have that, so we can't eliminate any of the choices yet. Let's do that. In the problem, they give us two numbers to multiply together in the second sentence. Do you see those two numbers?
anonymous
  • anonymous
36 times 60 is 2160. the other two numbers we can multiply is 18 and 1/2
FortyTheRapper
  • FortyTheRapper
In this problem, we just need to find the equation, we don't have to find an answer, so we can keep it at (36 * 60) For the other two numbers, he says each of the rooms 3 walls contains 8 windows. So 3 and 8 are the other two numbers we needed. You see where I got the 3 and 8 from?
anonymous
  • anonymous
Yes.
FortyTheRapper
  • FortyTheRapper
So we also have to multiply those two numbers, which means it would be (3 * 8) Now we can eliminate one answer. Do you see which choice isn't formatted as (3*8) exactly?
anonymous
  • anonymous
D
FortyTheRapper
  • FortyTheRapper
Right! So now we have (3 * 8)(36 * 60). We also have A, B, and C left So now, let's find the next part: the semi-circle. Let's first find the area of a regular circle first. Do you know what the area of a circle is?
anonymous
  • anonymous
Pie equals r 2
FortyTheRapper
  • FortyTheRapper
You have the right items, but the area wouldn't be pi = r^2, the pi would be multiplied, so you get area = pi * r^2
anonymous
  • anonymous
oh.
FortyTheRapper
  • FortyTheRapper
But we have a semi-circle, which is 1/2 of a circle. Seeing that it's 1/2 of a circle, what should we do with the area of a circle to make it a semi?
anonymous
  • anonymous
divide 1/2 ?
FortyTheRapper
  • FortyTheRapper
You wouldn't divide by 1/2, you would do the opposite of division, which is?
anonymous
  • anonymous
Multiply
FortyTheRapper
  • FortyTheRapper
Correct, so multiplying we get 1/2 * pi * r^2 But they gave us the R of this circle. Do you see what it is?
anonymous
  • anonymous
18
FortyTheRapper
  • FortyTheRapper
Yep!
anonymous
  • anonymous
B doesn't have 1/2 so we can take that answer choice out right ?
FortyTheRapper
  • FortyTheRapper
Yes, we can take B out. Good find
anonymous
  • anonymous
So it would be A ?
FortyTheRapper
  • FortyTheRapper
Yes it would be A! Because it area is r^2 and A shows that with 18^2 C just shows an 18. Good job
anonymous
  • anonymous
Thank you :)
FortyTheRapper
  • FortyTheRapper
Anytime!

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