Solve.A boat moves 10 kilometers upstream in the same amount of time it moves 15 kilometers downstream. If the rate of the current is 5 kilometers per hour, find the rate of the boat in still water.
A. 30 kilometers per hour
B. 10 kilometers per hour
C. 5 kilometers per hour
D. 25 kilometers per hour
Answer: D
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Factor the trinomial.20z2 + 7z - 6
A. (4z - 3)(5z + 2) B. (20z + 1)(z - 6) C. (4z + 3)(5z - 2) D. (20z + 3)(z - 2)
Solve the problem.A computer printer costs $360. If the sales tax rate is 5
%, how much tax is charged and what is the total price? Round your answers to the nearest cent.
A. $198.00, $558.00 B. $19.80, $379.80 C. $16.20, $376.20 D. $23.40, $383.40
Give the largest interval where the function increases or decreases, as requested.f(x) = -5x2 - 4; decreases
A. 
B. 
C. (0, ?)
D. (0, -?)
Solve the problem.Roberto invested some money at 7%, and then invested $4000 more than twice this amount at 12%. His total annual income from the two investments was $3890. How much was invested at 12%?
A. $26,000 B. $12,000 C. $22,000 D. $2600