Express the sum using summation notation. Use 1 as the lower limit of summation and i for the index of summation.3 + 6 + 9 + . . . + 27

A.
B.
C.
D.


Answer: D

Mathematics

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Solve the problem.The shape of a patio is trapezoidal with a height of 10 ft and bases of 17 ft and  What is the cost of outdoor carpeting to cover the patio if the carpeting costs  per ft2?

A. $816.75 B. $264.00 C. $770.00 D. $209.00

Mathematics

Find the center of mass of a thin plate covering the given region with the given density function.The triangular region cut from the first quadrant by the line y = -x + 3, with density ?(x) = x

A.  =  = 
B.  =  = 
C.  =  = 
D.  =  = 

Mathematics

Provide an appropriate response.In the following diagram, suppose that  = . Prove that XY is parallel to BC.

What will be an ideal response?

Mathematics

Find the nth term of the geometric sequence.a = -2; r = 

A. an =  (-2)n-1
B. an = -2 n-1
C. an = -2 n-1
D. an = -2 n

Mathematics