There are 19 children in Irene's preschool class. During free time yesterday, 7 of them chose to play dress-up. What is the experimental probability that a randomly selected preschooler would choose to play dress-up today?

37%

Step-by-step explanation:

There are 19 children, so the denominator is 19.

There were 7 playing dress-up, so the numerator is 7.

The fraction is . 7/19=0.3684~0.37

To convert decimals into percentage, mulitply by 100 and use a percent sign.

0.37*100=37%

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