Use the square root property to solve the equation. x2 = 49
A. {±7}
B. {24.5}
C. {7}
D. {±7i}
Answer: A
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with respect to the 
A. 
B. 
C. 
D. 
Simplify the expression using order of operations.
A. - 
B. - 
C. - 
D. - 
A survey of high school seniors from a certain school district who took the SAT has determined that the mean score on the mathematics portion was 450 with a standard deviation of 11.5. By a normal probability density function the data can be modeled as 
. Find the derivative of the model.
?
A. ?
B. ?
C. ?
D. ?
E. ?
A pebble is dropped into a calm pond, causing ripples in the form of concentric circles. The radius (in feet) of the outer ripple is 
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style="font-size:12pt;vertical-align:middle;" />. Find and interpret 
.
?
A. 
; represents the area of the circle at time t.
B. 
; represents the area of the circle at time t.
C. 
; represents the area of the circle at time t.
D. 
; represents the area of the circle at time t.
E. 
; represents the area of the circle at time t.