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.

the answer is 489

step-by-step explanation:

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1

answer: i think one of the answer is $150 and $300?

step-by-step explanation:

h= 12 inches

step-by-step explanation: