Solve the system using the inverse matrix method.
?b ? 0
A. x = 
, y = 1; 
B. x = 
, y = -1; 
C. x = 
, y = 1; 
D. x = 1, y = 
; 
Answer: C
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The graph of an exponential function is given. Match the graph to one of the following functions.
A. f(x) = 5x - 1 B. f(x) = 5x - 1 C. f(x) = 5x + 1 D. f(x) = 5x
In calm waters the oil spilling from the ruptured hull of a grounded tanker forms an oil slick that is circular in shape. If the radius 
of the circle is increasing at the rate of
?
feet/minute 
minutes after the rupture occurs.
?
Find an expression for the radius at any time 
. Hint: 
.
?
How large is the polluted area 8 minutes after the rupture occurred?
?
A. 
; 
ft2
B. 
; 
ft2
C. 
; 
ft2
D. 
; 
ft2
Solve the equation.-19 = 30 + f
A. f = -49 B. f = 11 C. f = -11 D. f = 49
Express the repeating decimal as a fraction in lowest terms.0.
A. 
B. 
C. 
D. 