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3 years ago

What value of r makes –6r + 2(r + 2) – 5 = -20 true?

1 answer:

4 0

Hello!

To find the answer we need to solve for r. First we undo the parentheses.

-6r+2r+4-5=-20

Now we combine like terms.

-4r-1=-20

We add one to both sides.

-4r=-19

Divide both sides by -4.

r=4.75

I hope this helps!

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Write 14/√2 + √50 in the form b√2 where b is an integer.

kifflom [539]

Answer:

$12 \sqrt{2}$

Step-by-step explanation:

Taking the terms one at a time,

$\frac{14}{ \sqrt{2} } \\ \frac{14 * \sqrt{2} }{ \sqrt{2} * \sqrt{2} } \\ \frac{14 \sqrt{2} }{2} \\ 7 \sqrt{2}$

$\sqrt{50} \\ \sqrt{25 * 2} \\ \sqrt{25}* \sqrt{2} \\ 5 * \sqrt{2} \\ 5 \sqrt{2}$

Adding the terms, you have;

$7 \sqrt{2} + 5 \sqrt{2} =(7 + 5) \sqrt{2} = 12 \sqrt{2}$

Hope it helps!

I'm out!

3 0

3 years ago

Read 2 more answers

4x^2-2x-4=0 solve using quadratic formula

MArishka [77]

Answer:

Step-by-step explanation:

Although you can start with 4x^2-2x-4=0, it's just slightly easier to reduce the coefficients. 4x^2-2x-4=0 becomes 2x^2 - x - 2 = 0.

The discriminant (part of the quadratic formula) is b^2 - 4ac. Using b = -1. a = 1 and c = -2, we get (-1)^2 - 4(2)(-2), or 17.

-b ± √(b^2 - 4ac)

Then the quadratic formula x = ---------------------------

-(-1) ± √17 1 ± √17

takes on the values x = ----------------- = ---------------

4 4

4 0

3 years ago

12 is 80% of what number

nydimaria [60]

X - the number

$80\%x=12 \\
\frac{80}{100}x=12 \\
\frac{4}{5}x=12 \\
x=12 \times \frac{5}{4} \\
x=3 \times 5 \\
x=15$

12 is 80% of 15.

3 0

3 years ago

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I will give brainlest answer

KonstantinChe [14]

4 units right and 4 units down

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4 years ago

PLEASE HELP ILL GIVE BRAINLIEST

liq [111]

Answer:

Step-by-step explanation:

BecASUE D IS THE NEXT IN THE PATTERN.

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3 years ago