M/3-6=-1 What is the answer help me fat

Can anyone me with 32,33,36,37,and 40.

Find an equation for the linear function which has slope -10 and x-intercept -7

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