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3 years ago

It takes21 minutes for 5 people to paint 7walls. How many minutes does it take 3people to paint 5 walls?

1 answer:

8 0

so 5 people work each one for 21 minutes, that means 21+21+21+21+21 minutes altogether, namely 105 minutes, it took that long for 7 walls, hmmmm how long for just one wall then? well, 105 ÷ 7, namely 15 minutes then, for just 1 wall.

now, if it takes 15 minutes of work to do one wall, what about 5 walls? well, that'd be 15*5 or 75 minutes.

so if we have 3 folks working, how much would each one work? well, 75 ÷ 3, namely 25 minutes, so each of them will work 25 minutes, namely 25+25+25 minutes, so in 25 minutes, they'll be done with 5 walls.

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The manufacturing of a ball bearing is normally distributed with a mean diameter of 22 millimeters and a standard deviation of .

Misha Larkins [42]

Answer:

0.1507 or 15.07%.

Step-by-step explanation:

We have been given that the manufacturing of a ball bearing is normally distributed with a mean diameter of 22 millimeters and a standard deviation of .016 millimeters. To be acceptable the diameter needs to be between 21.97 and 22.03 millimeters.

First of all, we will find z-scores for data points using z-score formula.

$z=\frac{x-\mu}{\sigma}$ , where,

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$P(-0.1875$

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3 years ago

Which pair of triangles attempts to use SSA Congruence Postulate to prove the triangles congruent?

Aleks [24]

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3 years ago

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julia-pushkina [17]

2
x
2
−
5
x
−
3
=
0
Step 3: Factor left side of equation.
(
2
x
+
1
)
(
x
−
3
)
=
0
Step 4: Set factors equal to 0.
2
x
+
1
=
0
or
x
−
3
=
0
x
=
−
1
2
or
x
=
3
Answer:
x
=
−
1
2
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3

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