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2 years ago

PLS HELP WILL GIVE BRAINLIEST

Mathematics

2 answers:

Montano1993 [528]2 years ago

6 0

Answer-none of the above

Explanation - does not match up.

pantera1 [17]2 years ago

6 0

Awnser: none of the above
Explanation: none of them logically makes any sense in that form

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Does anyone know how to do this?

Strike441 [17]

Answer:

$196 m^{2}$

Step-by-step explanation:

A square is a shape that which all sides are equal

14 is one side of the square and to find the area of a square/rectangle, you do length*width

14*14=196

6 0

2 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:

$9-8x-x^2=25-(16+8x+x^2)=5^2-(x+4)^2$

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

$\displaystyle\int\frac{5\cos 
y}{5\sqrt{1-\sin^2y}}\,\mathrm dy=\int\frac{\cos y}{\sqrt{\cos^2y}}\,\mathrm dy$

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

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

which implies that $-\dfrac\pi2\le y\le\dfrac\pi2$ . (This is the range of the inverse sine function.)

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

$\displaystyle\int\frac{\mathrm dx}{\sqrt{9-8x-x^2}}=\sin^{-1}\left(\frac{x+4}5\right)+C$

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2 years ago

Select the point that is a solution to the system of inequalities.

IceJOKER [234]

It would be C since it’s in between both inequalities and in the shaded region.

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2 years ago

a cargo plane flew to the maintenance facility and back. it took one hour less time to get there than it did to get back. The av

polet [3.4K]

The trip took 57 hour

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2 years ago

(6 + (–2)) + 2 • (–8) • 42 = ________ A.1024 B.768 C.–256 D.–252

inna [77]

It should be -668 maybe answer B is a typo

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2 years ago