Someone please help me answer this it would help alot :)

0.479 times 8.04

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

The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean

Can someone me with these two circle theorem questions asap?