Complete the identity.sin(4?) sin(6?) cos(4?) cos(6?) = ?
A. 
B. 
C. cos2(48?)
D. 
Answer: D
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Determine whether the statement is true or false.If a > b, then a must be a positive number.
A. True B. False
Rewrite the polynomial in descending order.Rewrite p4q4 + 4p2q2 - 6p3q + pq3 + 5p6 in descending powers of p.
A. p4q4 + pq3 + 4p2q2 - 6p3q + 5p6 B. 5p6 + p4q4 + 4p2q2 - 6p3q + pq3 C. 5p6 + p4q4 - 6p3q + 4p2q2 + pq3 D. 5p6 + p4q4 - 6p3q + pq3 + 4p2q2
Find the axis of symmetry of the quadratic function.f(x) = -7(x - 5)2 - 9
A. x = 5 B. x = -5 C. x = -9 D. x = -7
Solve the problem.The function f(x) = 600(0.5)x/90 models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. Find the amount of radioactive material in the vault after 
Round to the nearest whole number.
A. 378 pounds B. 200 pounds C. 212 pounds D. 450 pounds