Use the sum formulas to find the value of the sum that follows.
?

?

A. 720
B. 160
C. 435
D. 820
E. 90


Answer: D

Mathematics

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Perform the indicated operation involving cylindrical coordinates.Find the rectangular coordinates of the point whose cylindrical coordinates are.

A.
B.
C.
D.

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Decide whether or not the set is closed under multiplication.W - {2}

A. Not closed B. Closed

Mathematics

Simplify. ? 

A. 17,639
B.
C.
D. 17,638

Mathematics

Write the first n terms of the given arithmetic sequence (the value of n is indicated in the question).a3 = -18, d = 4, n = 5

A. -18, -14, -10, -6, -2 B. -18, -22, -26, -30, -34 C. -10, -14, -18, -22, -26 D. -26, -22, -18, -14, -10

Mathematics