What is the sum of the first 6 terms of the geometric series 1+3+9...?

What is fraction that is equivalent to 3/8

Astudent showed the steps below while solving the inequality |x-4|< 1 by graphing.

Rena used the steps below to evaluate the expression , when . step 1: substitute into the expression. step 2: simplify the parentheses. step 3: evaluate the power to a power. step 4: use reciprocals and find the value. in which step did rena make the first error?