You have purchased 10 large pizzas in order to prepare for a party that will be equally shared amongst the guests, but you are not sure how many guests
will arrive. The function models the amount of pizza each person gets as a
function of how many guests arrive.
S(x) = 10x^2
S(x) = 10x
S(x) = 1.10^x
S(x) = Square root of 10x
S(x) = 1(1/10)^x

here is a big fat

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.