Can someone please show me only how to do the number 6 through 9 step by step number bonds it’s so confuse to me please

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 a function for a rotation 90 degrees counter clockwise about the origin, point 0

Find the commission on a $590.00 sale if the commission is 15%.