Ihave a big math test tomorrow and a question on the review packet my teacher made for my class just doesn't make sense to me. here it
for a 'black friday' sale, everything in a store is 10% off the original price. if ana purchased an item that was marked with a sale price of $40, what was the original price?
my teacher said the answer was $44.44 but i don't understand how she got that, can someone ?

Evaluate the function , when d = {9, 15, 30}. r = {5, 7, 12} r = {6, 10, 15} r = {6, 10, 20} r = {5, 12, 20}

Afair die is cast four times. calculate the probability of obtaining exactly two 6's round to the nearest tenth of a percent

Drag the tiles to the correct boxes to complete the pairs. match the exponential functions with their horizontal asymptotes and y-intercepts. f(x) = 7x − 4 f(x) = 3x+2 + 4 f(x) = 9x+1 − 4 f(x) = 2x + 4 horizontal asymptote and y-intercept exponential function horizontal asymptote: y = 4 y-intercept: (0, 5) arrowboth horizontal asymptote: y = -4 y-intercept: (0, 5) arrowboth horizontal asymptote: y = -4 y-intercept: (0, -3) arrowboth horizontal asymptote: y = 4 y-intercept: (0, 13) arrowboth