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son4ous [18]
3 years ago
13

Please help 20 points

Mathematics
2 answers:
insens350 [35]3 years ago
7 0

Step-by-step explanation:

4•10/11 +7•9/11

=54/11+86/11

=140/11

=12•8/11

Snezhnost [94]3 years ago
5 0

Answer:

12\frac{8}{11}

Step-by-step explanation:

4\frac{10}{11} +7\frac{9}{11}

→ Add the whole numbers and numerators

11\frac{19}{11}

→ Turn into proper mixed fraction

12\frac{8}{11}

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4y=-3-x<br> 7x-4y=43<br> elimination please help!!
riadik2000 [5.3K]

Answer:

x = 5 y =-2

Step-by-step explanation:

You can substitute the 4y in,
7x - (-3-x) = 43
7x + 3 + x = 43
8x + 3 = 43
8x = 40
x = 5

Then plug the x back into the equation,
4y = -3 - 5
4y = -8
y = -2

4 0
2 years ago
Read 2 more answers
Alessandro and Francesca raced each other home from school. It took Francesca 13/15 as long as Alessandro to run home. Who got h
slega [8]
Francesca would have gotten home first.
5 0
3 years ago
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-129 = -48 - n <br> Thank you
Flauer [41]

−129=−48−n

Simplify:

−129=−48+−n

Flip the equation.

−n−48=−129

Add 48 to both sides.

−n−48+48=−129+48

−n=−81

Divide both sides by -1.

−n/−1  =  −81/−1

n=81


3 0
3 years ago
Pls, can you help me? thx.<br><img src="https://tex.z-dn.net/?f=%20%5Ccos%28x%20%2B%20%5Cfrac%7B%5Cpi%7D%7B3%7D%29%20%5Cgeqslant
Veseljchak [2.6K]

For x between -\pi and \pi, we have

  • \cos x=\frac{\sqrt2}2=\frac1{\sqrt2} when x=\pm\frac\pi4;
  • \cos x=1 for x=0; and
  • \cos x=0 for x=\pm\frac\pi2

\cos x is continuous over its domain, so the intermediate value theorem tells us that

\cos x\ge\frac{\sqrt2}2

is true for -\frac\pi4\le x\le\frac\pi4.

For all x, we take into account that \cos x is 2\pi-periodic, so the above inequality can be expanded to

-\dfrac\pi4\le x+2n\pi\le\dfrac\pi4

where n is any integer. Equivalently,

-\dfrac\pi4-2n\pi\le x\le\dfrac\pi4-2n\pi

To get the corresponding solution set for

\cos\left(x+\dfrac\pi3\right)\ge\dfrac{\sqrt2}2

simply replace x with x+\frac\pi3:

-\dfrac\pi4-2n\pi\le x+\dfrac\pi3\le\dfrac\pi4-2n\pi

\implies\boxed{-\dfrac{7\pi}{12}-2n\pi\le x\le-\dfrac\pi{12}-2n\pi}

7 0
3 years ago
A pair of parallel lines is cut by a transversal:
morpeh [17]
35 degrees
reason:alt. angle,//lines
7 0
3 years ago
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