Solve.The braking distance D in feet required for a car traveling x miles per hour to stop on wet, level pavement can be approximated by D = 
x2. If the braking distance is 45 feet, estimate the speed of the car. If necessary, round to the nearest mile per hour.
A. 7 mph
B. 20 mph
C. 405 mph
D. 5 mph
Answer: B
Mathematics
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Provide an appropriate response.The standard normal probability density function is defined by f(x) = 
e- x2/2. (a) Show that 
dx = 
.(b) Use the result in part (a) to show that the standard normal probability density function has mean 0.
What will be an ideal response?
Mathematics
Find the indicated vector.Let u = 
, v = 
. Find u - v.
A. 
B. 
C. 
D. 
Mathematics
Use the given information to find the quadrant in which ? lies.sin ? > 0 and cos ? < 0
A. Quadrant I B. Quadrant III C. Quadrant IV D. Quadrant II
Mathematics
Write the shaded area in the figure as a mixed number and as an improper fraction.
A. 1
; 
B. 1
; 
C. 1
; 
D. 2
; 
Mathematics