Add.3.6 + (-6.3)
A. -2.7
B. 9.9
C. -9.9
D. 2.7
Answer: A
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Solve. Write your answer in simplest form.There were 21
yards of wire on a spool. After a customer bought 3
yards of wire from the spool, how many yards were left?
A. 18
yards
B. 17 yards
C. 16
yards
D. 17
yards
For the given functions f and g, find the requested composite function.f(x) = 5x + 10, g(x) = 4x - 1;
Find the function f ? g.
A. 20x + 39 B. 20x + 15 C. 20x + 9 D. 20x + 5
Solve the problem.The surface area of a cylindrical can is represented by the polynomial expression ? r2 + ? r2 + 2?rh, where h is the height of the can and r is its radius. Find a polynomial expression for the surface area of a can whose radius and height are equal.
A. 8?r2 or 8?h2 B. 16?r2 or 16?h2 C. 4?r2 or 8?h2 D. 4?r2 or 4?h2
The reliability of a new model of CD player can be described by the exponential function 
where the reliability R is the probability (as a decimal) that the CD player is still working t years after it is manufactured. Round the answer to the nearest hundredth. Then write your answer as a percent.What is the probability that the CD player will still work 4 years after it is manufactured?
A. 9% B. 2% C. 92% D. 27%