Evaluate the exponential function at the specified value of x.f(x) = 2x, x = 9
A. 
B. 
C. 18
D. 512
Answer: D
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Solve the system by the substitution method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(1, 1)}
B. infinitely many solutions; {
x + y = 6} or {
x = -y}
C. {(1, 5)}
D. no solution; ?
The life expectancy E, in solar lifetimes, of a star is related to the mass M, in solar masses, by the formula
.
?
A: Make a graph of the life expectancy versus the mass. Include up to 20 solar masses.B: Does a larger star have a longer or shorter life expectancy?C: If one star is double the mass of another, how do their life expectancies compare? Express your answer as a percent.
?
Round your answer to two decimal places if necessary.
?
What will be an ideal response?
Write out the first five terms of the sequence.an = 
A. - 
, 1 , 
, 1 , 
B. 1, 1, 1, 1, 1
C. - 
, - 
, 
, 
, 
D. 1, - 
, 1, 
, 1
Find a formula for the inverse of the function described below.A size 12 dress in Country C is size 64 in Country D. A function that converts dress sizes in Country C to those in Country D is 
A. f-1(x) = 
- 20
B. f-1(x) = x - 20
C. f-1(x) = 
+ 20
D. f-1(x) = 