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3 years ago

5

Giving brainleist. what is 9 + 10

2 answers:

marissa [1.9K]3 years ago

8 0

19 it’s just simple math

iren2701 [21]3 years ago

7 0

21 because 9+10 is actually 21

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A cube with 4 faces has a length of 4.5cm.find the total surface area

qwelly [4]

Answer:

81 cm square

Step-by-step explanation:

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3 years ago

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Please help me estimate the answer of 7987 divided by 39

Sauron [17]

204.79

Step-by-step explanation:

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3 years ago

When p is false and q is true, then p or q is true or not?

Afina-wow [57]

True, because "or" is a logical sum.

true = 1
false = 0,
sum (1+0) = 1, true.

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3 years ago

Solve the equation for all real values of x.<br> cosxtanx - 2 cos x=-1

IceJOKER [234]

Solution to equation $cosxtanx - 2 cos^2 x=-1$ for all real values of x is $x=2k\pi + \frac{\pi}{6} , x=2k\pi + \frac{5\pi}{6}$ .

<u>Step-by-step explanation:</u>

Here we have , $cosxtanx - 2 cos^2 x=-1$ . Let's solve :

⇒ $cosxtanx - 2 cos^2 x=-1$

⇒ $cosx(\frac{sinx}{cosx}) - 2 cos^2 x=-1$

⇒ $sinx = 2 cos^2 x-1$

⇒ $sinx = 2 (1-sin^2x)-1$

⇒ $sinx = 1-2sin^2x$

⇒ $2sin^2x+sinx-1=0$

By quadratic formula :

⇒ $sinx = \frac{-b \pm \sqrt{b^2-4ac} }{2a}$

⇒ $sinx = \frac{-1 \pm \sqrt{1^2-4(2)(-1)} }{2(2)}$

⇒ $sinx = \frac{-1 \pm3}{4}$

⇒ $sinx = \frac{1}{2} , sinx =-1$

⇒ $sinx = sin\frac{\pi}{6} , sinx = sin\frac{3\pi}{2}$

⇒ $x=\frac{\pi}{6} , x=\frac{3\pi}{2}$

But at $x=\frac{3\pi}{2}$ we have equation undefined as $cos\frac{3\pi}{2}=0$ . Hence only solution is :

⇒ $x=\frac{\pi}{6}$

Since , $sin(\pi -x)=sinx$

⇒ $x=\pi -\frac{\pi}{6} = \frac{5\pi}{6}$

Now , General Solution is given by :

⇒ $x=2k\pi + \frac{\pi}{6} , x=2k\pi + \frac{5\pi}{6}$

Therefore , Solution to equation $cosxtanx - 2 cos^2 x=-1$ for all real values of x is $x=2k\pi + \frac{\pi}{6} , x=2k\pi + \frac{5\pi}{6}$ .

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3 years ago

Determina si el número 2,340 es divisible por 2,3,5,9,y 10. Explica tu respuesta.

Eddi Din [679]

2340 es divisible por estos números. La resonanica wue entran en este número es porque todos son factores de este número.

6 0

3 years ago

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