Perform the addition or subtraction and write the result in standard form.
?

?

A. ?
B. ?
C.

D.

E.

Answer: D

Mathematics

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Determine whether the improper integral converges or diverges.

A. Diverges B. Converges

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Find the center and radius of the circle.x2 - 2x + y2 - 14y + 25 = 0

A. (1, 7), r = 5 B. (1, 7), r = 25 C. (-1, -7), r = 5 D. (-1, -7), r = 25

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Solve the problem.Joe has traveled  of his total trip. If the trip is a total of 640 miles, how many miles has he gone?

A. 102 miles
B. 128 miles
C. 512 miles
D. 256 miles

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A pebble is dropped into a calm pond, causing ripples in the form of concentric circles. The radius (in feet) of the outer ripple is , wheretis the time in seconds after the pebble strikes the water. The area of the circle is given by the function 

style="font-size:12pt;vertical-align:middle;" />. Find and interpret .
?

A. ;  represents the area of the circle  at time t.
B. ;  represents the area of the circle  at time t.
C. ;  represents the area of the circle  at time t.
D. ;  represents the area of the circle at time t.
E. ;  represents the area of the circle  at time t.

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Mathematics