Can anyone me with this and give me steps because i can’t figure it out

The answer to your question is:   BD = 7.5

Step-by-step explanation:

Data

C is the midppoint of AD

B is the midpoint of AC

AC = 5

BD = ?

Process

We know that B is the mid point of AC, then AB = BC

                                  AB + BC = 5

                      but              2AB = 5

                                         AB = 5/2

                                        AB = 2.5  = BC

Then   AC = CD if   AC = 5 then CD = 5

Finally

                     BD = BC  + CD

                     BD = 2.5 + 5

                     BD = 7.5

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)