On a number line whats the distance between -8 and -2 ?

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

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)

Write the equations in logarithmic form 7^3=343