Find the sum of the first 8 terms of the geometric series: 32 -16 +8 -4 + ...

Figure abcd is a parallelogram. if point c lies on the line x = 2, what is the y-value of point c

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

Combine like terms to make a simpler expression 3z+z