Evaluate the function at the indicated value.Find  when f(x) = x2 + 7x - 5.

A. 2x+ h - 5
B.
C. 1
D. 2x+ h + 7


Answer: D

Mathematics

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Solve the problem.Let y(t) be the concentration of a substance in a chemical reaction. The change in the concentration, under appropriate conditions, is modeled by the equation  where k > 0 is a rate constant and the positive integer n is the order of the reaction. Solve the initial value problem for a third-order reaction , assuming y(0) = 3 and k = 0.3.

A. y = 
B. y = 
C. y = 
D. y = - 

Mathematics

Express in terms of a base raised to a positive exponent. Then simplify, if possible.-x-8

A. -x8
B. - 
C.
D. - 

Mathematics

Round the whole number to the given place value.3073, thousands

A. 3100 B. 2900 C. 3000 D. 4000

Mathematics

Solve the problem.Assume that the elevation E, in feet, of a sag in a proposed route is given by  where x represents the horizontal distance in feet along the proposed route and 0 ? x ? 5000. For what x-values is the elevation 1150 feet? Round your answer to the nearest foot.

A. x = 556 ft or x = 7510 ft B. x = 556 ft or x = 7500 ft C. x = 566 ft or x = 7510 ft D. x = 566 ft or x = 7500 ft

Mathematics