Solve the problem.ABC phone company charges $22 per month plus 
per minute for phone calls. XYZ phone company charges $13 per month plus 7¢ per minute for phone calls. How many minutes of phone calls should be made each month to make XYZ phone company a better deal?
A. more than 30 min
B. fewer than 300 min
C. more than 300 min
D. fewer than 30 min
Answer: B
Mathematics
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Solve the initial value problem.v'(t) + 
= 6, v(-1) = 0
A. v = -12(et/2 + 1/2 + 12) B. v = -12e-t/2 - 1/2 + e1/2 C. v = -12(e-t/2 - 1/2 - 1) D. v = 3e-t/2 - 1/2 + 3
Mathematics
Find the difference.-5 - 10
A. 5 B. -15 C. 15 D. -5
Mathematics
?Use the provided definition to find f(A): If f is the polynomial function,
, then for an 
matrix A, f(A) is defined to be
. Given that 
, 
.
?
A. ?
B. ?
C. ?
D. ?
E. ?
Mathematics
Solve the problem. Use 3.14 to approximate the value of ?. Round to nearest tenth unless instructed differently.Find the area of the circular racetrack. Round to the nearest foot.r = 85 ftR = 135 ft
A. 31,400 ft2 B. 22,687 ft2 C. 34,540 ft2 D. 57,227 ft2
Mathematics