The ratio of 3 to 4 and the ratio of 4 to 3 are or are not the same number

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

The solution set for 5v2 – 125 = 0 is

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