Luis has 40 noah 45 nickels , 33 dimes, 10 quarters and 18 fifty-cent coins . how much money does he have

$13.75 should be your answer

Step-by-step explanation:

Note that 45 nickles = 45 x 5 = 225 cents

Note that 10 quarters = 10 x 25 = 250 cents

Note that 18 half-dollars = 18 x 50 = 900 cents.

225 cents = $2.25

250 cents = $2.50

900 cents = $9

Add

2.25 + 2.50 + 9 = 13.75

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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."