Summer used 2/5 of her ground beef to make burgers. If she used 3/4 pounds of beef how much beef did she have at first

Can any one me with the answers to these questions asap?

Solve for x and select the correct answer

What is the sum of the geometric series in which a1 = 7, r = 3, and an = 1,701? hint: cap s sub n equals start fraction a sub one left parenthesis one minus r to the power of n end power right parenthesis over one minus r end fraction comma r ≠ 1, where a1 is the first term and r is the common ratio