Rene completed a 10 mile run in 1 hour 20 minutes. Which calculation would give her average speed (mph)?

Mathematics

1 answer:

Whitepunk [10]3 years ago

8 0

Answer:

Step-by-step explanation:

1hour 20 min = 80 min then divide 80 by 10

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80.34 / 3 = 26.78

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A boy is twice as tall as his little sister and 30cm shorter than his father. Their combined height is 3.8 meters. Find (in cm)

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Answer:

Call the sister's height x. The boy is twice as tall, so that's 2x. The father is 30 cm taller than the boy, so his height is 2x + 30. The combined height is 3.8m, which is 380cm. Now you can write an equation

x + 2x + 2x + 30 = 380

collect like terms

5x = 350

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the sister is 70cm tall, the boy is 2*70 = 140 cm, and the father is 140 + 30 = 170cm

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Step-by-step explanation:

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Write an expression using the distributive property that can be used to find the quotient of 126 divided by 7

mina [271]

Well, let's discover how many times 7 goes into 126 first.

7 x 11 = 77
7 x 12 = 84
7 x 13 = 91
7 x 14 = 98
7 x 15 = 105
7 x 16 = 112
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Well, 7 goes into 126 - 18 times - therefore the quotient is 18. The use of the distributive property wouldn't be necessary.

Nevertheless, you could say that:

$\frac { 126 }{ 14 } \\ \\ =\frac { 140-14 }{ 7 } \\ \\ =\frac { 140 }{ 7 } -\frac { 14 }{ 7 } \\ \\ =20-2\\ \\ =18$

* I've used the distributive property above.

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