(2a^2 + 7a - 10)(a - 5) expanded to a polynomial in standard form

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

Find the equation of the line with slope =8 and passing through (6,53) write your equation in the form y=mx+b

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%