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Sedaia [141]
3 years ago
6

I need help with this question pleas e

Mathematics
1 answer:
ollegr [7]3 years ago
4 0

Answer:

B

Step-by-step explanation:

The double angle formulae for cosine is

cos2x = cos²x - sin²x

[ using sin²x + cos²x = 1 ]

cos2x = cos²x - (1 - cos²x) = cos²x - 1 + cos²x = 2cos²x - 1

Also cos2x = (1 - sin²x) - sin²x = 1 - sin²x - sin²x = 1 - 2sin²x

The double angle formulae are

cos2x = cos²x - sin²x = 2cos² - 1 = 1 - 2sin²x

Hence

cos60° = cos²30° - sin²30°

cos60° = 2cos²30° - 1

cos60° = 1 - 2sin²30°

B is not a representation of cos60°

         

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I don’t understand the question and I can’t find anything in my notes to help
lara [203]

Step-by-step explanation:

The problem states that you have a linear function so expect your equation to have this form:

y = mx + b

where m is the slope and b is the y-intercept. You are also given two points: P1(5, 6) and P2(14, 60). Use these points to solve for the slope m.

m = (y2 - y1) / (x2 - x1) = (60 - 6)/(14 - 5)

= 54/9 = 6

So our equation now becomes

y = 6m + b

To solve for b, plug in the values of P1:

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Therefore, our equation is

y = 6m - 24

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7 0
3 years ago
What is the volume of a rectangular prism with a length of 7m, a hight of 9m and a width of 11m
vazorg [7]
Hello!

To find the Volume of the Rectangular Prism, you'll need to multiply all of the measurements together. So you'll need to multiply 7, 9, and 11 together.

V=7*9*11

First, you'll need to multiply 7 and 9. Once you've multiplied 9 and 7 together, you should have 63. Now you should multiply 63 and 11 together. Once you've multiplied 63 and 11 together, you should have a Volume of 693

You should have a Volume of 693m³

I hope this helps!
5 0
3 years ago
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