PLEASE HELP 23) Given that X-B(n, p), E(X)=20 and Var(x)=12, find:

a. The value of n and of p.
b. P(X=21)

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?

Fast! find the length of cu. the triangles are similar. show your work.

Which shows the first equation written in slope-intercept form? 1/2 (2y + 10) = 7x