How do l find the mean, Variance of the following data; 10:2, 15:3, 7:2, 20:3

The jones farm has 24 cows that each produce 52 quarts of milk a day. how many quarts are produced each day altogether

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

The power generated by an electrical circuit (in watts) as a function of its current c (in amperes) is modeled by p(c)= -15c(c-8) what current will produce the maximum power?