Rearrange the formulas.d = rt; solve for t
A. t = 
B. t = dr
C. t = d - r
D. t = 
Answer: A
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Write a matrix equation equivalent to the system of equations.-2x + 4z = 16 9y + 7z = 538x + 6y + 2z = 38
A. 
=
B.
  =  |
C.
=
D.
= 
Find the volume of the solid generated by revolving the region about the y-axis.The region in the first quadrant bounded on the left by y = x3, on the right by the line 
, and below by the x-axis
A. 
?
B. 
?
C. 
?
D. 
?
Solve the problem.The function f(t) = -0.15t2 + 0.49t + 31.7 models a certain country's population in millions, ages 65 and older, where t represents years after 2010. The function g(t) = 0.56t2 + 12.55t + 105.7 models the total yearly cost of the government's health insurance program in billions of dollars, where t represents years after 2010. What does the function 
represent? Find 
(15).
A. Cost per person in thousands of dollars. $79.24 thousand B. Cost per person in thousands of dollars. $0.01 thousand C. Cost per person in thousands of dollars. $0.17 thousand D. Cost per person in thousands of dollars. $7.65 thousand
Simplify.2257 ? 10
A. 225,700 B. 22,570 C. 225,710 D. 2,257,100