Solve the problem.The function f(x) = 800(0.5)x/100 models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. Find the amount of radioactive material in the vault after 
Round to the nearest whole number.
A. 214 pounds
B. 211 pounds
C. 555 pounds
D. 760 pounds
Answer: A
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Find the indicated sum. Find the sum of the first 10 terms in the geometric series 
+ 
+ 
. . .
A. - 
B. - 
C. 
D. 
Use the Binomial Theorem to find the indicated coefficient or term.The 3rd term in the expansion of (7x + 6)3
A. 36 B. 1512x C. 882x2 D. 756x
Solve the problem.From a thin piece of cardboard 20 in. by 20 in., square corners are cut out so that the sides can be folded up to make a box. What dimensions will yield a box of maximum volume? What is the maximum volume? Round to the nearest tenth, if necessary.
A. 10 in. × 10 in. × 5 in.; 500 in3 B. 13.3 in. × 13.3 in. × 3.3 in.; 592.6 in3 C. 13.3 in. × 13.3 in. × 6.7 in.; 1185.2 in3 D. 6.7 in. × 6.7 in. × 6.7 in.; 296.3 in3
Simplify the expression using the order of operations.-(-4)3
A. -12 B. -64 C. 64 D. -1