9 * 8 - 7 is equal to the output. if the input is -1 what is the output

Itook a better photo of the question so y’all can see it i hope it’s a fine photo

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

Problem fathi wants to print out a pdf document that is 48 pages long. to save paper, he decides to print on both sides of each sheet and to print two pages on each side of the sheet. how many sheets of paper will he need?