Which expression represents "the product of 8 squared and the difference of a number, n and 9"

Tell me the expression. 17 points.

Answer asap ill give ! ’ a sample of radioactive material decays over time. the number of grams, y , of the material remaining x days after the sample is discovered is given by the equation y = 10(0.5)^x. what does the number 10 represents in the equation? a. the half-life of the radioactive material, in days b. the amount of the sample, in grams, that decays each day c. the time, in days, it will take for the samples to decay completely d. the size of the sample, in grams, at the time the material was discovered

Sum of the interior angles of a pentagon

Find the missing factor. write your answer inexponential form.9^2=9^4×