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Yuri [45]
3 years ago
15

U'LL GET BRAINLIEST IF U ANSWER FIRST

Mathematics
1 answer:
Tanzania [10]3 years ago
6 0

Answer:

\boxed{\bold{a+2b}}

Explanation:

  • <u>Simplify expression to find its equivalent</u>

<u></u>

Expand \bold{2\left(a+2b\right): \ 2a+4b}

= \bold{2a+4b-a-2b}

Simplify \bold{2a+4b-a-2b: \ a+2b}

= \bold{a+2b}

Mordancy.

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Simply 22.5+7(n-3.4)
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The answer is 7n-1.3. Use the distributive property to multiply 7 by n-3.4. Subtract like terms and it's simplified
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3 years ago
What is 4+2(5)+(-3)=
Pavel [41]

Answer:

The answer is 11, I think, hope this helps!

Step-by-step explanation:

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2 years ago
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What percent of 12 is 48<br> A. 0.25%<br> B. 4% <br> C. 25%<br> D. 40% <br> E. 400%
Step2247 [10]

Answer: the answer is 25 percent

Step-by-step explanation: 25 percent times 48 is 12

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3 years ago
Evaluate Dx / ^ 9-8x - x2^
Solnce55 [7]
It depends on what you mean by the delimiting carats "^"...

Since you use parentheses appropriately in the answer choices, I'm going to go out on a limb here and assume something like "^x^" stands for \sqrt x.

In that case, you want to find the antiderivative,

\displaystyle\int\frac{\mathrm dx}{\sqrt{9-8x-x^2}}

Complete the square in the denominator:

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Now substitute x+4=5\sin y, so that \mathrm dx=5\cos y\,\mathrm dy. Then

\displaystyle\int\frac{\mathrm dx}{\sqrt{9-8x-x^2}}=\int\frac{5\cos y}{\sqrt{5^2-(5\sin y)^2}}\,\mathrm dy

which simplifies to

\displaystyle\int\frac{5\cos &#10;y}{5\sqrt{1-\sin^2y}}\,\mathrm dy=\int\frac{\cos y}{\sqrt{\cos^2y}}\,\mathrm dy

Now, recall that \sqrt{x^2}=|x|. But we want the substitution we made to be reversible, so that

x+4=5\sin y\iff y=\sin^{-1}\left(\dfrac{x+4}5\right)

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Under these conditions, we have \cos y\ge0, which lets us reduce \sqrt{\cos^2y}=|\cos y|=\cos y. Finally,

\displaystyle\int\frac{\cos y}{\cos y}\,\mathrm dy=\int\mathrm dy=y+C

and back-substituting to get this in terms of x yields

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4 0
3 years ago
an official playing field (including end zone) for the indoor football league has a length 39 yd longer than its width. the peri
ch4aika [34]

Answer:

42

Step-by-step explanation:

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162 - 78 = 2 lengths =84

84/2 = 42

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3 years ago
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