70 pennies decreased by 20%

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

What is the measure of one interior angle of a pentagon