Multiply. Assume all variables represent nonnegative real numbers.6( + )

A. 6 + 5x
B. 30 + 30x
C. 6 + 5x
D. 6 + 30x


Answer: D

Mathematics

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Find the length of the indicated portion of the curve.r(t) = (2cos t)i + (2sin t)j + 3tk, 0 ? t ? ?/2

A. ?
B. ?
C. ?
D. ?

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Solve.The average summer temperature in the Antarctica was -25°F and the average winter temperature was  How much higher was the summer average temperature?

A. 31°F B. -81°F C. -31°F D. 81°F

Mathematics

Multiply.(-7)(-7)(-7)

A. -343 B. 343 C. -333 D. -353

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Solve.A projectile is fired upward from the ground with an initial velocity of 300 feet per second. Neglecting air resistance, the height of the projectile at any time t can be described by the polynomial -16t2 + 300t. Find the height of the projectile at t = 5 seconds.

A. 1420 ft B. 1200 ft C. 1500 ft D. 1100 ft

Mathematics