A bank offers a savings account which pays 3% interest per year. The amount of money in the account after t years is represented by the expression P(1 +
-)", where P represents the initial amount of money invested, n represents the number of times per year
the interest is compounded, i represents the interest rate, and t represents the number of years the money has been invested.
Which statement describes what happens with the savings account when the interest is compounded monthly instead of yearly?
Select two that apply.

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- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed