See if you can solve this because this is really difficult for me.

add up all numbers 4+7+5+4+5=25, divide by number of days 25/7 = $3.57

The answer is $5.

Step-by-step explanation:

To find the average amount of money Mandy earned per day, add all the numbers together, which equals $25.

$4 + $7 + $5 + $4 + $5 = $25

Next, divide $25 by the total amount of numbers in the set, which 5.

$25 divided by 5 equals $5.

Thus, Mandy earns an average of $5 per day delivering groceries.

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