Find the standard form of the equation for the ellipse satisfying the given conditions. Center (0, 0); vertices (±8, 0); c = 4

A.   +   = 1
B.  +  = 1
C.  +   = 1
D.  +  = 1


Answer: D

Mathematics

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What will be an ideal response?

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Solve.The president of a certain university receives a salary three times the salary of one of the department heads. The total of the two salaries is $250,000. Determine the salaries.

A. president's salary = $18,750; department head's salary = $6250 B. president's salary = $62,500; department head's salary = $187,500 C. president's salary = $187,500; department head's salary = $62,500 D. president's salary = $125,000; department head's salary = $62,500

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Mathematics

Solve the problem.The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 72 seconds are required to make a 3-by-4 in. enlargement, find the time required for a 4-by-7 in. enlargement.

A. 140 seconds B. 196 seconds C. 168 seconds D. 224 seconds

Mathematics