What is the 1 ..i have circled that they have put ..and why

What is the solution to the equation 9^(x+1) =27

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Draw a scaled copy of the circle using a scale factor of 2