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3 years ago

Which expression represents a rational number?

Mathematics

2 answers:

vesna_86 [32]3 years ago

6 0

Answer:

Step-by-step explanation:

2/7+sqrt121 is just 2/7+11.

This is rational.

balu736 [363]3 years ago

3 0

Answer:

2/7 + sqrt 121

Step-by-step explanation:

the square root of 121 is a whole number - 11, which is rational and makes the equation rational

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Answer:

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Step-by-step explanation:

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3 years ago

Addie walked 2 1/2 miles in 45 minutes. Suzie covered 2 2/5 miles in 2/3 of an hour.

NeX [460]

Addie's speed was $3\frac{1}{3}\ mph$

Step-by-step explanation:

Given,

Distance walked by Addie = $2\frac{1}{2}=\frac{5}{2}\ miles$

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1 hour = 60 minutes

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Addie's speed was $3\frac{1}{3}\ mph$

Keywords: speed, distance

Learn more about speed at:

#LearnwithBrainly

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4 years ago

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We have the similar triangles. Therefore the lengths of the sides are in proportion:

$\dfrac{x}{22}=\dfrac{42}{11+22}\\\\\dfrac{x}{22}=\dfrac{42}{33}\qquad\text{cross multiply}\\\\33x=(22)(42)\qquad\text{divide both sides by 33}\\\\x=\dfrac{(22\!\!\!\!\!\diagup^2)(42)}{33\!\!\!\!\!\diagup_3}\\\\x=\dfrac{(2)(42\!\!\!\!\!\diagup^{14})}{\not3_1}\\\\x=(2)(14)\\\\\boxed{x=28}$

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3 years ago