Verify the identity.(cos ? + sin ?)2 + (cos ? - sin ?)2 = 2(cos2? + sin2?)
What will be an ideal response?
(cos ? + sin ?)2 + (cos ? - sin ?)2 
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Graph y = f(x) and y = |f(x)| in the standard viewing rectangle. Determine the x-intercept for the graph of y = |f(x)|.y = 9 - 3x
A. 
x-intercept is -3.
B. 
x-intercept is 3.
C. 
x-intercept is 0.
D. 
x-intercept is 3.
Use the quadratic formula or graphing methods to solve the inequality.8x2 - 36x + 8 ? 0
A. x ? 
? 0.234 or x ? 
? 4.266
B. 
? 0.234 ? x ? 
? 4.266
C. x ? 
? 0.234
D. x ? 
? 4.266
Multiply or divide as indicated.
÷ 
A. 
B. 
C. 
D. 
Solve the problem.Tim and Judy mix two kinds of feed for pedigreed dogs. They wish to make 25 pounds of feed worth 
per pound by mixing one kind worth 
per pound with another worth 
per pound. How many pounds of the cheaper kind should they use in the mix? (Round to the nearest whole number)
A. 22 pounds B. 17 pounds C. 10 pounds D. 8 pounds