Solve the problem.Police use the formula s = (30fd)1/2 to estimate the speed s of a car in miles per hour, where d is the distance in feet that the car skidded and f is the coefficient of friction. If the coefficient of friction on a certain dry road is 0.81 and a car was traveling on it at a rate of 
how far will the car skid? (Round to the nearest foot.)
A. 608 ft.
B. 103 ft.
C. 35 ft.
D. 83 ft.
Answer: B
Mathematics
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A. (0, -9) B. (0, 9) C. (9, 0) D. (-9, 0)
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A. 0.0222 B. 2.0022 C. 0.2022 D. 2.000022
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Solve the problem.A ball is thrown vertically upward from the ground at a velocity of 98 feet per second. Its distance from the ground after t seconds is given by 
How fast is the ball moving 4 seconds after being thrown?
A. 136 ft per sec B. 34 ft per sec C. -30 ft per sec D. -42 ft per sec
Mathematics