Evaluate. If necessary, find common denominators and simplify completely.4
+ 12
A. 15
B. 16
C. 17
D. 4
Answer: B
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Use a calculator with a 
key or a 
key to solve the problem.Research suggests that the probability of a certain fuse malfunctioning increases exponentially as the concentration of an impurity in the fuse increases. The probability is modeled by the function y = 4(257,911)x, where x is the impurity concentration, and y, given as a percent, is the probability of the fuse malfunctioning. Find the probability of the fuse malfunctioning for an impurity concentration of 0.12. Round to the nearest percent.
A. 4% B. 12% C. 30% D. 18%
Solve the problem.Suppose you borrow $7500 for a term of five years at simple interest and 
% APR. How much is the total (principal plus interest) you must pay back on the loan?
A. $7809.38 B. $8118.75 C. $309.38 D. $10,593.75 E. $3093.75
Solve the problem.Find the simple interest if $4300 is borrowed at 9% for 9 months (0.75 yr).
A. $29,025.00 B. $358.33 C. $290.25 D. $516.00
For the given functions f and g, find the requested composite function value.f(t) = 
, g(t) = 
;
Find (f ? g)(12).
A. 1369 B. 37 C. 53 D. 780