Simplify the polynomial by combining like terms: - 7r + 6t - s - 5r + 12s + 4t - t + 5s - r.
a.13r + 16s + 9t
b. -13r -16s + 9t
c. -13r + 16s + 9t
d. -13r -16s -9t
c. -13r + 16s + 9t
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Refer to the double-bar graph below which shows the number of male (M) and female (F) athletes at a university over a four-year period. Solve the problem. 
YEARHow many more male athletes than female athletes were there in 1986?
A. 150 B. 100 C. 50 D. 0
Graph the solution set of the inequality, where x is an integer, on the number line.-1 < x + 2 ? 6
A. 
B. 
C. 
D. 
Use the basic identities to simplify the expression.
- sec ?
A. -3 B. 2 sec2 ? - 3 C. 3 D. 0
Solve the problem.The width of a rectangle is 6 kilometers less than twice its length. If its area is 176 square kilometers, find the dimensions of the rectangle.
A. length = 8 km, width = 10 km
B. width = 11 km, length = 16 km
C. length = 3 km, width = 
km
D. length = 11 km, width = 16 km