Math Problem 30 points please help

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

Select the correct answer from the drop-down menu. subtracting 3xy^2 from 8xy^2 gives the same result as the expression. [tex]3xy ^{2} - 8xy ^{2} [/tex][tex] { - 7xy}^{2} - {2xy}^{2} [/tex][tex] {7xy}^{2} - {2xy}^{2} [/tex]

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')