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.

pi x^2

step-by-step explanation:

pi times x squared

it would be 3 ÷by 6 because the number on each side

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.