Solve the equation by factoring.5x2 + 21x = 20
A. 
B. 
C. 
D. 
Answer: A
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Find the measures of two angles, one positive and one negative, that are coterminal with the given angle.131°
A. 401°; -139° B. 491°; -229° C. 311°; -49° D. 491°; -49°
Differentiate the function.r(t) = (cot t)i + (csc t)j
A. r'(t) = (sec2 t)i + (tan t sec t)j B. r'(t) = (-csc2 t)i - (cot t csc t)j C. r'(t) = (-sec2 t)i - (tan t sec t)j D. r'(t) = (csc2 t)i + (cot t csc t)j
Determine whether the statement is true for n = 1, 2, 3, 4, and 5. Use the number of true statements as your answer.n2 - n + 17 is prime.
A. 5 B. 4 C. 2 D. 3
Solve the problem. Round to tenths where necessary.P(x) = -x3 + 
x2 - 60x + 100, x ? 5 is an approximation to the total profit (in thousands of dollars) from the sale of x hundred thousand tires. Find the number of hundred thousands of tires that must be sold to maximize profit.
A. 4.5 hundred thousand B. 5.5 hundred thousand C. 5 hundred thousand D. 4 hundred thousand