Here is a general rule for sin and cos
sin x = cos (90 - x)
cos x = sin (90 - x)
These rules are complementary, so for your problem
cos 75 = sin (90 - 75) = sin 15 as your answer.
On row 1, E is the wrong one because it should be 9n but its 8n instead
On row 2, P is the wrong one because it should be 6x but its 6+3x instead
On row 3, N is the wrong one because it should be 2x+2 but its 3x instead
On row 4, R is the wrong on because it should be 11a+3 but its 14a instead
On row 5, R is the wrong one because it should be 18n but its 9n instead
On row 6, M is the wrong one because it should be 15x+3 but its 15x+45 instead
On row 7, A is the wrong one because it should be 14t+4 but its 18t instead
On row 8, E is the wrong one because it should be 3n+21 but its 9+7n
The variable most important in the following problem is B. The price of 40,000 tents.
The price of 40,000 tents is the total purchase of the sale.
40,000 x 25 = 1,000,000
The Army bought 40,000 tents at 25 each for a total purchase price of 1,000,000.
The addition of the polynomials 
and 
in the proper location on the grid is 
How to find the addition of two polynomials is proper location on the grid ?
Polynomials addition in proper location means add the coefficient of same power of variable
So the addition of polynomials like this
The addition of the polynomials is 
Learn more about the addition of the polynomials here:
brainly.com/question/28049904
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