PLEASE HELP PLEASE 6. Jean hasn't played tennis in awhile and wants to work on his first serve. His first serve
percentage is 64%.
a) Jean hits 10 first serves. Find the probability that he is successful on exactly 8 first
serves.
b) Jean hits 20 first serves. Find the probability that he is successful on 12 or less first
serves.
c) Jean hits 50 first serves. Find the probability that he is successful on more than 30 first
serves.
d) Jean hits 100 first serves. Find the mean and standard deviation of this practice session.

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

step-by-step explanation:

what are the statements? and what do you mean by "216 2 1 6"?

-12 > a

step-by-step explanation:

-11 > 1 + a

subtract 1 from each side

-11 -1> 1 -1+ a

-12 > a