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3 years ago

Which expression has the same value as the one below?

2 answers:

6 0

I believe the answer is B

38+ (-18) turns into 38-18 because after removing the parentheses around -18 there is no need for the +

marta [7]3 years ago

5 0

Answer:

answer is B 38-18

Step-by-step explanation:

38 + (-18)

38-18

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Simplify radical 175

Dominik [7]

$\sqrt{175}=\sqrt{5^{2}\cdot 7}=5\sqrt{7}$

7 0

3 years ago

∫(sec(lnx)tan(lnx)) /x

Dafna11 [192]

Substitute $y=\ln x\implies\mathrm dy=\dfrac{\mathrm dx}x$ , then the integral becomes

$\displaystyle\int\frac{\sec(\ln x)\tan(\ln x)}x\,\mathrm dx=\int\sec y\tan y\,\mathrm dy$
$=\sec y+C$

$=\sec(\ln x)+C$

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3 years ago

Solve in |R 2cos(2x) +√2 = 0

Alexxx [7]

It is given that:

$\begin{gathered} 2\cos 2x+\sqrt[]{2}=0 \\ 2\cos 2x=-\sqrt[]{2} \\ \cos 2x=-\frac{\sqrt[]{2}}{2} \end{gathered}$

cos2x is negative square root 2 divided by 2 in the second and third quadrants, so it follows:

$\begin{gathered} \cos 2x=\cos \theta \\ 2x=2n\pi\pm\theta \end{gathered}$

Here theta is given by:

$\theta=\pi-\frac{\pi}{4}=\frac{3\pi}{4},\theta=\pi+\frac{\pi}{4}=\frac{5\pi}{4}$

So the solution is given by:

$\begin{gathered} 2x=2n\pi\pm\frac{3\pi}{4};2x=2n\pi\pm\frac{5\pi}{4} \\ x=n\pi\pm\frac{3\pi}{8};x=n\pi\pm\frac{5\pi}{8} \end{gathered}$

4 0

1 year ago

Find the exact perimeter of quadrilateral ABCD plotted below. A-3,2) B(6,-2) D(0,-6) C(3.-6)

Helen [10]

Answer: The answer is B......

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Help me solve showing work

lbvjy [14]

Answer:

Explanation:

I'm going to convert all the fractions into decimals

⁻¹⁄₂x + 9.5 + x - ¾ + 2.5x

= -0.5x + 9.5 + x - 0.75 + 2.5x

Group like terms

-0.5x + x + 2.5x + 9.5 - 0.75

Add similar elements: -0.5x + x + 2.5x = 3x

= 3x + 9.5 - 0.75

Add / subtract: 9.5 - 0.75 = 8.75

- PNW

6 0

3 years ago