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Ipatiy [6.2K]
3 years ago
7

What is the value of (4x2-10)/y when x=5 and y=6 A. –15 B. 10 C. 15 D. 20

Mathematics
1 answer:
Simora [160]3 years ago
8 0

Answer: C. 15

Step-by-step explanation:

Good Luck!

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Debora plans to sew 3 blankets for each of her nieces.
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Answer:15

Step-by-step explanation: Debora has to take the numbers 3 and 5 and multiply. 3x5= 15

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2 years ago
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An equivalent expression with a rational denominator is...
Whitepunk [10]

Given the expression,

(8x-56x^2)/(\sqrt{14x-2})

We will have to rationalize the denominator first. To rationalize the denominator we have to multiply the numerator and denominator both by the square root part of the denominator.

[(8x-56x^2)(\sqrt{14x-2})]/[(\sqrt{14x-2})(\sqrt{14x-2})]

If we have (\sqrt{a})(\sqrt{a}), we will get \sqrt{a^2} by multiplying them. And \sqrt{a^2} = a.

So here in the problem, we will get,

[(8x-56x^2)(\sqrt{14x-2})]/(14x-2)

Now in the numerator we have (8x-56x^2). We can check 8x is common there. we will take out -8x from it, we will get,

-8x(-1+7x)

-8x(7x-1)

And in the denominator we have 14x-2. We can check 2 is common there. If we take out 2 from it we will get,

2(7x-1)

So we can write the expression as

[(-8x)(7x-1)(\sqrt{14x-2})]/[2(7x-1)]

(7x-1) is common to the numerator and denominator both, if we cancel it we will get,

(-8x)(\sqrt{14x-2})/2

We can divide -8 by the denominator, as -8 os divisible by 2. By dividing them we will get,

(-4x)(\sqrt{14x-2})

(-4x)(14x-2)^(1/2)

So we have got the required answer here.

The correct option is the last one.

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3 years ago
Find the percent error of 4cm and 0.2 cm? Please help, thanks.
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The percent error is 1,900%
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A hiker begins at sea level and descends 25 feet every minute. How long will it take to get to an elevation of -750 feet?
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Answer:

it would take about 7 1/2 minutes.

Step-by-step explanation:

please give brainliest

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Find the size of angle XYZ.<br>Give your answer to 1 decimal place.<br>Z<br>13 cm<br>x<br>Y<br>4 cm​
Rzqust [24]

Answer:

<h2><em>7</em><em>2</em><em>.</em><em>9</em><em>°</em></h2>

<em>sol</em><em>ution</em><em>,</em>

<em>tan \: y \:  =  \frac{13}{4}  \\ y =  {tan}^{ - 1}  ( \frac{13}{4} ) \\ y = 72.9</em>

<em>hope</em><em> </em><em>this</em><em> </em><em>helps</em><em> </em><em>.</em><em>.</em><em>.</em><em>.</em>

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