3 years ago

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Mathematics

1 answer:

jeka943 years ago

7 0

Answer:

D (30)

Step-by-step explanation:

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If y varies directly with x when y=8,x=20 find the value of x when y=42

Alecsey [184]

The value of x is 105 when y=42

Step-by-step explanation:

A direct proportion means that the change in one quantity will also cause the change in other quantity

Given

y varies directly with x

x ∝ y

when the proportionality symbol is removed a proportionality constant is introduced

$x=ky\\k=\frac{x}{y}\\Putting\ y=8\ and\ x=20\\k=\frac{20}{8}\\k = \frac{5}{2}\\So,\ the\ equation\ will\ be\\x=\frac{5}{2}y\\Putting\ y=42\\x=\frac{5}{2}*42\\x=5*21\\x= 105$

The value of x is 105 when y=42

Keywords: Proportion, Direct variation

Learn more about proportion at:

#LearnwithBrainly

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3 years ago

What is -3 = h + 8 divided by 2?

Kaylis [27]

Answer:

h = -7

Step-by-step explanation:

- 3 = h + 4

- 3 - h = 4

- h = 4 + 3

- h = 7

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3 years ago

Is negative 17/24th bigger or smaller than negative 11/12

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It would be smaller because 11/12 = 22/24

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Anna007 [38]

Answer:

Surface area is 72

The surface area unit is square centimeters, or $cm^{2}$

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Tanzania [10]

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Step-by-step explanation:

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