9^2 - (4 / 2) + 8 * 2

Me. i can't figure out this question. give an explanation too. .

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?

Arectangular garden is 5 feet long and 3 feet wide. a second rectangular garden has dimensions that are double the dimensions of the first garden. what is the percent of change in perimeter from the first garden to the second garden?