Express x^2 +8x-9 in the form (x+a)^2 + b. Where a and b are integers.

Solve with work adding cheese to a mcdonalds quarter pounder increases the fat content from 21g to 30g. what is the percent of change ?

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Agrid shows the positions of a subway stop and your house. the subway stop is located at (-5,2) and your house is located at (-9,9). what is the distance, to the nearest unit, between your house and the subway stop?