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The number of cards left is 600-280=320.
So the 320 cards left are what percent? we count it like this:

=53.3..%
so the answer is 53.3%
Answer:
Option b (1/2,1/3)
Step-by-step explanation:
we have
2x-3y=0 ------> equation A
4x+6y=4 -----> equation B
Solve the system by elimination
Multiply equation A by 2 both sides
2(2x-3y)=2(0)
4x-6y=0 ------> equation C
Adds eqution B and equation C
4x+6y=4
4x-6y=0
-------------
4x+4x=4+0
8x=4
x=1/2
Find the value of y
2x-3y=0
2(1/2)-3y=0
1-3y=0
3y=1
y=1/3
the solution is the point (1/2,1/3)
Its T : 400
H : 20 Hope this help fam because 200 isn't the answer.
I'm 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 participants