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3 years ago

The value of y varies directly with the value of x. When y = 72, x = 6. What is the value of y when x = 10?

Mathematics

1 answer:

yKpoI14uk [10]3 years ago

7 0

Answer:

y = 120

Step-by-step explanation:

Given that y varies directly with x then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition when y = 72, x = 6, then

72 = 6k ( divide both sides by 6 )

12 = k

y = 12k ← equation of variation

When x = 10, then

y = 12 × 10 = 120

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3 years ago

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3 years ago

Read 2 more answers

each time kim pour water from a jug into a glass, exactly 10% of the water remaining in the jug is used. What is the minimum num

Gnoma [55]

The correct answer is:

At least 7 times.

Explanation:

Since 10% of the water in the jug is removed each time, this means that 100-10=90% of the water remains.

After two times, we would have 0.9(0.9) = 0.81 = 81% of the water; each time she pours, the number of times 0.9 is multiplied by itself changes. This makes this an exponential inequality (it is not an equation, as we want "less than half of the water"):

$0.5 < 0.9^x$