Multiply. Simplify if possible.4 ? 1

A. 4
B. 4
C. 5
D. 8


Answer: C

Mathematics

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Find the center of mass of a thin plate covering the given region with the given density function.The region bounded by the curves y = ±  and the lines x = 1 and x = 9, with density ?(x) = 

A.  = 5,  = 0
B.  = 4,  = 0
C.  = 2,  = 0
D.  = 3,  = 0

Mathematics

Solve the problem.A laminated lab bench has 1 inches of plywood, 2 inches of pressed board, and  inches of formica. What is the thickness of the lab bench?

A. 1 in.
B.  in.
C. 5 in.
D.  in.

Mathematics

Solve the problem.Numbered disks are placed in a box and one disk is selected at random. If there are 6 red disks numbered 1 through 6, and 4 yellow disks numbered 7 through 10, find the probability of selecting a yellow disk, given that the number selected is less than or equal to 3 or greater than or equal to 8.

A.
B.
C.
D.

Mathematics

Find the exact value of the expression.

A.
B.
C.
D. 2

Mathematics