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Mathematics

1 answer:

Aleksandr [31]3 years ago

6 0

Answer:

Step-by-step explanation:

cos2θ = 2 cos^2 θ - 1

2cos^2 θ = 1 + cos2θ

cos^2 θ = (1 + cos2θ)/2

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How do you expand (x-10)(x-10)

denpristay [2]

1 Answer
1.multiply the First terms. x⋅x=x2.
2.multiply the Outside terms. x⋅10=10x.
3.multiply the Inside terms. −10⋅x=−10x.
4.multiply the Last terms. −10⋅10=−100.
5.add all of the answers together. x2+10x−10x−100.
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4 years ago

Evaluate 13- (-9) need helpp

Viktor [21]

Answer:

The answer is 22.

Explanation:

Multiply -1 by -9.

$13 + 9$

Add 13 + 9.

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Therefor, the answer is 22.

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3 years ago

Solve the system of linear equations. separate the x- and y- values with a coma. 20x=-58-2y

lianna [129]

The best way to solve is by using elimination method.
20x = -58 - 2y
17x = -49 - 2y
Multiply second equation by -1
20x = -58 - 2y
-17x = 49 + 2y
Add equations.
3x = -9
Divide.
x = -3
Plug in -3 into one of the equations.
17(-3) = -49 - 2y
-51 = -49 - 2y
Add 49 to both sides.
-2 = -2y
Divide.
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3 years ago

there are 30 students in a math class of the 30 students 30% have an a in math 40% have a b in math how many students have a c i

stepladder [879]

the answer is 9

30 percent of 30 is 9

40 percent of 30 is 12

12+9 =21

30-21 =9

3 0

3 years ago

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