Use a grapher to find the vertex, rounding to the nearest hundredth when necessary.f(x) = -5x2 - 4x + 5
A. (2, 5.8)
B. (0.4, 5.8)
C. (-0.4, 4.2)
D. (-0.4, 5.8)
Answer: D
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Find the value of x in: 
.
A.
??x = 16
B.
??x = 9
C.
??x = 8
D.
?
E.
?x = 7
Solve the problem.The half-life of a radioactive element is 130 days, but your sample will not be useful to you after 80% of the radioactive nuclei originally present have disintegrated. About how many days can you use the sample?
A. 297 B. 312 C. 287 D. 302
Solve the problem.You have just graduated from college and purchased a car for $9,000. Your credit limit is $16,000.Assume that you make no payments and purchase nothing more and that there are no other fees. The monthly interest rate is 13%. Write an exponential equation to determine how much you will owe (represented by y) after x months with no more purchases or payments.
A. y = 9,000(1.13)x B. y = 16,000(1.13)x C. y = 9,000(1.87)x D. y = 16,000(1.87)x
Find the volume.
A. 154
ft3
B. 168
ft3
C. 84
ft3
D. 20
ft3