Factor completely.5x2 - 15xy - 20y2
A. (5x - 5y)(x + 4y)
B. 5(x - y)(x + 4y)
C. 5(x + y)(x - 4y)
D. prime
Answer: C
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Calculate the instantaneous velocity for the given value of t of an object moving with rectilinear motion according to the given function relating s (in ft) and t (in s)s = 5t3 - 5t2 + 10; t = 5
A. 365 ft/s B. 25 ft/s C. -25 ft/s D. 325 ft/s
Graph the equation for the given values of z.z = x + y2, z = -4, z = -1, z = 0, z = 1, z = 4
A. 
B. 
C. 
D. 
Solve the problem.Anne and Nancy use a metal alloy that is 20% copper to make jewelry. How many ounces of a 14% alloy and a 24% alloy must be mixed to form 100 ounces of the desired alloy?
A. 30 at 14% and 70 at 24% B. 60 at 14% and 40 at 24% C. 40 at 14% and 60 at 24% D. 70 at 14% and 30 at 24%
Use the power rules for exponents to simplify. Write the answer in exponential form.(z7)2
A. z14 B. z9 C. 7z2 D. (z2)14