A study population is: Group of answer choices that aggregation of elements from which the sample is actually selected. the theoretically specified aggregation of study elements. the hypothetical aggregation of all the elements in a study. that aggregation or set of elements considered for selection in some stage of sampling.

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

12

step-by-step explanation:

12 + 5 = 17

12x2=24

24-7=17

the answer is mp

step-by-step explanation: