Solve. Round your answer to the nearest tenth, if necessary.An object is thrown upward from the top of a  building with an initial velocity of 48 feet per second. The height, h, of the object after t seconds is given by the quadratic equation  When will the object hit the ground?

A. In 5 seconds
B. In 160 seconds
C. In 2 seconds
D. In 7 seconds


Answer: A

Mathematics

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Simplify the expression. Assume that all variables are positive when they appear.

A. 23 B. ±8 C. 64 D. 8

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Decide whether the statement is an example of the commutative, associative, identity, inverse, or distributive property.9 + (-9) = 0

A. Associative B. Inverse C. Identity D. Commutative

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Find the union.{a, b, c, d, e} ? {f, g, h, i, j}

A. ? B. {a, b, c, d, e} C. {e, f} D. {a, b, c, d, e, f, g, h, i, j}

Mathematics

Solve the equation. Check for extraneous solutions.

A.
B.
C.
D.
E. no solution

Mathematics