Estimate the value of the quantity.The table shows the velocity of a remote controlled race car moving along a dirt path for 8 seconds. Estimate the distance traveled by the car using 8 subintervals of length 1 with left-end point values.

A. 134 in.
B. 258 in.
C. 119 in.
D. 129 in.

Answer: D

Mathematics

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Evaluate the given double integral by changing it to an iterated integral. S is the triangular region in the first quadrant bounded by the lines x = y/4, x = 1, y = 0, and y = 4

A. (e - 1)
B. (e - 1)
C. 64(e + 1)
D. e

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Mathematics

Solve the equation.4(x - 9) = 0

A. 9 B. -9 C. 4 D. -4

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Mathematics

Solve.A boat moves 7 kilometers upstream in the same amount of time it moves 18 kilometers downstream. If the rate of the current is 7 kilometers per hour, find the rate of the boat in still water.

A. 15 km/hr
B. 7 km/hr
C. 4 km/hr
D. 11 km/hr

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Mathematics

Find the equation of the parabola with the given focus and directrix.

A. x = - y2
B. y = - x2
C. y = -2x2
D. y = -8x2

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Mathematics