Could any body help me with this

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

What are the soultion(s) to the quadratic equation 40- x^2=0

The table below shows the approximate height of an object x seconds after the object was dropped. the function h(x)= -16x^2 +100 models the data in the table. for which value of x would this model make it the least sense to use? a. -2.75 b. 0.25 c. 1.75 d. 2.25