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katovenus [111]
3 years ago
9

Jill swam 200 meters in 2 minutes and 42 seconds. If each lap is 50 meters long, which time is her estimated, time, in seconds,

per lap?
A. 32
B. 60
C. 48
D. 40
Mathematics
1 answer:
Sergeeva-Olga [200]3 years ago
5 0

Answer:

D. 40

Step-by-step explanation:

First, calculate the total time she took in seconds.

Convert minutes to seconds using 60 seconds = 1 minute

2 min X 60 s = 120 s

Total time = 120 s + 42 s = 162 s

Calculate the total number of laps.

Convert metres to laps using 50 metres = 1 lap

Laps = 200 m ÷ 50 m = 4 laps

Divide the total time by the number of laps to calculate the unit rate, which is time per one lap.

Since it says to <u>estimate, round 162 seconds</u>.

162 s ≈ 160 s

160 s ÷ 4 laps ≈ 40s/lap

Her estimated time per lap is 40s.

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A ball is thrown from an initial height of 2 meters with an initial upward velocity of 9/ms

Balls height h= 2 +9t -5t^2

To find all values of t for which the ball's height is 3 meters

We plug in 3 for h and solve for t

h= 2 +9t -5t^2

3 = 2 +9t -5t^2

Solve for t

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t= \frac{-b+- \sqrt{b^2-4ac} }{2a}

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After simplifying this,

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Step-by-step explanation:

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3 years ago
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Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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