Write the sum using summation notation, assuming the suggested pattern continues.

-9 - 4 + 1 + 6 + + 66

summation of negative forty five times n from n equals zero to fifteen

summation of the quantity negative nine plus five n from n equals zero to fifteen

summation of the quantity negative nine plus five n from n equals zero to infinity

summation of negative forty five times n from n equals zero to infinity

It's the second choice

Step-by-step explanation:

Note that the numbers values increase by 5 .

When n = 0 , we have -9 + 5(0) = -9

when n = 1 it is -9 + 5(1) = -4

when n = 2 it is -9 + 5(2) = 1      and so on.

when n = 15 (the last term)  66 = -9 + 5(15).

We can write the summation as:

n=15

∑ (-9 + 5n)

n=0.

step-by-step explanation:

what is the question? i am guessing you are looking for the area.

to find an area, you have to do length x width.

in this case, it would be 12 ft x 4 ft = 48 sq. ft