Use the product-to-sum identities to rewrite the expression as the sum or difference of two functions.sin 5? sin 3?
A. sin2 15?2
B. 
sin 8? + 
cos 2?
C. 
cos 2? - 
cos 8?
D. 
cos 8? - 
cos 2?
Answer: C
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Solve the problem.Given the velocity and initial position of a body moving along a coordinate line at time t, find the body's position at time t.v = cos 
t, s(0) = 1
A. s = 
sin 
t + ?
B. s = 2? sin 
t
C. s = sin t
D. s = 
sin 
t
Translate the indicated expression.The length of a rectangle is five times the width subtracted from ten. If the width is represented by w, then write and expression that describes the length.
A. 5w - 10 B. 10 - 5w C. 5l - 10 D. 5(10 - w)
A system of nonlinear equations is given. Sketch the graph of the equation of the system and then determine the number of real solutions to the system. Do not solve the system.x2 + y2 = 252y + x = 5
A. Two
B. Two
C. One
D. Zero
Determine whether the statement is true or false.Consider the simplex method for a canonical linear programming problem in which each entry in the vector b is positive. If the variable x3 is to be brought into solution then row i will be chosen as the pivot row if the ratio 
is the largest among all ratios for which ai3 > 0.
A. True B. False