Give an example of an additional problem in which you would and would not group the addends differently to add.

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

How is working backward similar to solving an equation?

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d?