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3 years ago

How much time is needed for a boy on roller skates to slow down from 17.4

Mathematics

1 answer:

erica [24]3 years ago

6 0

Answer:

Step-by-step explanation:

v²-u²=2as

9.11²-17.4²=2a×45

a=-(17.4²-9.11²)/90=-(302.76-82.9921)/90=-219.7679/90 m/s²

v=u+at

9.11=17.4-219.7679/90 t

9.11-17.4=-219.7679/90t

-8.29×90=-219.7679t

t=-746.1/-219.7679≈3.395 s

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(PLSSSS HELP) Determine which three out of the six points shown below are a solution to the equation x-3y=22 Plot the three poin

algol [13]

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$(-2,8)$ $(7,5)$ $(1,7)$

Step-by-step explanation:

Given

$x + 3y = 22$

Solving (a): The possible coordinates

We have:

$(x,y) = (-2,8)$

This gives:

$x + 3y = 22 \to -2 + 3 * 8$

$x + 3y = 22 \to -2 + 24$

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This gives:

$x + 3y = 22 \to 7 + 3 * 5$

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$x + 3y = 22 \to 22$

(7,5) is a point on the grid

$(x,y) = (-5,5)$

This gives:

$x + 3y = 22 \to -5 + 3 * 5$

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(-5,5) is a not point on the grid

$(x,y) = (1,3)$

This gives:

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$x + 3y = 22 \to 1 + 9$

$x + 3y = 22 \to 10$

(1,3) is a not point on the grid

$(x,y) = (1,7)$

This gives:

$x + 3y = 22 \to 1 + 3 * 7$

$x + 3y = 22 \to 1 + 21$

$x + 3y = 22 \to 22$

(1,7) is a point on the grid

So, we plot the following on the grid

$(-2,8)$ $(7,5)$ $(1,7)$

See attachment

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