3 years ago

What is the reciprocal? -2 8/9

Mathematics

1 answer:

scoray [572]3 years ago

3 0

Answer:

Step-by-step explanation:

-8/9 is the reciprocal i believe

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Solve the equation on the interval [0, 2pi): 12cos^2 x-9=0<br><br><br> What to do?

siniylev [52]

Answer:

$\large\boxed{x=\dfrac{\pi}{6}\ \vee\ x=\dfrac{5\pi}{6}\ \vee\ x=\dfrac{7\pi}{6}\ \vee\ x=\dfrac{11\pi}{6}}$

Step-by-step explanation:

$12\cos^2x-9=0\qquad\text{add 9 to both sides}\\\\12\cos^2x=9\qquad\text{divide both sides by 12}\\\\\cos^2x=\dfrac{9}{12}\\\\\cos^2x=\dfrac{9:3}{12:3}\\\\\cos^2x=\dfrac{3}{4}\to\cos x=\pm\sqrt{\dfrac{3}{4}}\\\\\cos x=\pm\dfrac{\sqrt3}{2}\\\\\text{Look at the picture}\\\\x=\dfrac{\pi}{6}\ \vee\ x=\dfrac{5\pi}{6}\ \vee\ x=\dfrac{7\pi}{6}\ \vee\ x=\dfrac{11\pi}{6}$

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3 years ago

Will mark brainliest <br> Please do 11 and 13

tia_tia [17]

Answer:

question 11 - $20,020.83

question 13 - $97,200

Step-by-step explanation:

I=prt

I = 450 x 6% x 8

I=prt

I= 116.25 x 1550 / 9

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3 years ago

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85 percent of what is 64.6?

castortr0y [4]

Answer:

54.91

Step-by-step explanation:

64.6/x=100/85

(64.6/x)*x=(100/85)*x

64.6=1.17*x (divide both sides of the equation by 1.17 to get x)

54.91=x

x=54.91

now we have 85% of 64.6= 54.91

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3 years ago

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Answer:

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2 years ago

(3x^2 - 2x + 7)(x^2 + 2x)

Verdich [7]

3x-2=2x-7

We simplify the equation to the form, which is simple to understand
3x-2=2x-7

We move all terms containing x to the left and all other terms to the right.
+3x-2x=-7+2

We simplify left and right side of the equation.
+1x=-5

We divide both sides of the equation by 1 to get x.
x=-5

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3 years ago

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