Write and evaluate the expression. Then, select the correct answer. The sum of forty-five and a number;

evaluate when n = 1.1
You get 50 points

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

Write the pair of fractions as a pair of fractions with a common denominator

Someone me! will award brainliest if u explain and answer!