Find the 9th partial sum of the summation of 3i minus 4, from i equals 1 to infinity.
a) 102
b) 99
c) 205
d) 200

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

2x^2+5x+17

your welcome. : )