You would subtract 90% and 35% and get 55%. You subtract that by 20 and yiu will have 35% of the 90% mixture
The kinetic energy transfers from the moving ball to the non-moving ball.
Kelli ran 4 more miles than the week before, so to find what percent that is of 28, divide.
4 / 28 = 0.142857143, or ~14.29%
Kelli ran 14.2857143% or about 14.29% more miles than last week.
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parallel lines
same slope