Find the sum of -2.5, -3 and 6.7

Find the area of the regular hexagon if a side is 20 cm.

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

Find the value of x to the nearest tenth.