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2 years ago

If y varies directly as x and y = 9 when x = –3, find y when x = 40.

Mathematics

1 answer:

DedPeter [7]2 years ago

8 0

Answer:

y = -120

Step-by-step explanation:

Direct variation is

y = kx where k is a constant

9 = k(-3)

Divide each side by -3

9/-3 = k

-3 = k

y = -3x

Let x = 40

y = -3(40)

y = -120

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a coin is taken at random froma purse that contains one penny, 2 nickels, 4 dimes, and 3 quarters. let x be the value of the dra

algol [13]

Answer:

x = 12.6 pennies

Step-by-step explanation:

total number of coins = 1 + 2+ 4 + 3 = 10 coins

P(penny) = $\dfrac{1}{10}$

P(nickels) = $\dfrac{2}{10}$

P(dimes) = $\dfrac{4}{10}$

P(quarters) = $\dfrac{3}{10}$

hence average value of the coin

x = Penny x P(Penny) + nickel x P(nickel) + dimes x P(dimes) + quarters x P(quarters)

nickels = 5 pennies dimes = 10 ; and quarters = 25 pennies

$x = 1 \times \dfrac{1}{10} + 5\times \dfrac{2}{10} +10\times \dfrac{4}{10} + 25\times \dfrac{3}{10}$

x = 0.1 + 1 + 4 + 7.5

x = 12.6 pennies

hence, the average pennies for the first draw is equal to x = 12.6 pennies

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2 years ago

Given a non-zero rational number, a, and an irrational number, b, what can be said about the product of a and b?

laiz [17]

Answer:

The product of a non-zero rational number and an irrational number is irrational.

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2 years ago

Need help urgently please

OLga [1]

Answer:

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2 years ago

Tonya said that the fraction 10/12 was in simplest form. Do you agree? Why or why not?

Zarrin [17]

Answer:

Step-by-step explanation:

You can reduce the fraction by dividing by 2. If you divide by 2, then you will get 5/6 which is more reduced than 10/12.

Hope this helps plz mark brainliest if correct :D

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2 years ago

Read 2 more answers

What is the value of x in the equation 3x – 4y = 65, when y = 4? x = 23 x = 27 x=13 1/4 x=21 2/3

Vikki [24]

x=27

hope thats helpful

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3 years ago