Please help ! Sorry If picture isn’t the best quality

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 rational number in lowest terms 99/-15

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two