A skydiver begins by free-falling, and then uses a parachute to float the rest of the way to the ground. The relationship between the skydiver's height while free-falling (in m above the ground), t seconds after jumping, is given by h=-1.7t^2+3050. The relationship between the the skydiver's height while using the parachute (in m above the ground), t seconds after jumping, is given by h=-5t+1650. When did the skydiver pull her parachute, and how high above the ground was she when she did this?

- (2, -7)

- lines r and s and lines t and u must be parallel

slope =   (y2 -y1) ÷ (x2 -x1)

slope = (0 -0) / (-5, -7)

slope = 0 / -12 = 0

the slope of the line is zero.   it is perfectly horizontal.

step-by-step explanation:

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.