Please help I really need it

Brainlest answer can you find the area and circumference of a circle given the radius or diameter? if its yes or no explain why

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

Determine the required value of the missing probability to make the distribution a discrete probability distribution. x p(x) 3 0.23 4 ? 5 0.51 6 0.08 p(4) = nothing  (type an integer or a decimal.)