Im not sure about the given data but I plotted the scatter plot based on what I understand on how the data should be presented.
Time (years)
3, 6, 9, 12, 15, 18, 21, 24
Number of participants(x1000)
22, 25, 28, 14, 17, 20,15, 9
Attached is the scatter plot created online.
x = time (years)
y = number of participantep explanation
A= base x height = 3x4 = 12 ft
Answer: y = -0.2(x - 2.25)² + 1.6125
<u>Step-by-step explanation:</u>
Jenny: x
Thomas: 3x
Ali: x-5
Jenny: 12
Thomas: 3 x 12= 36
Ali: 7
Thomas is 24 years older than Jenny
The second one will be the answer
X= -2 and -7