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Crazy boy [7]
3 years ago
8

Which expression is equivalent to 6-8 x 65?

Mathematics
1 answer:
lakkis [162]3 years ago
4 0

Answer:

12-16 X 130

Step-by-step explanation:

Lol its asking for an equivalent expression meaning the same thing soooo... I just multiplied each number by two: 6X2= 12) 8X2=16) 65X2= 130) so the expression will be 12-16 X 65.

ps.

If u get any other answers with a different one than mine it doesnt mean its incorrect because there are infinite equivalent answers for this expression

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Indira finds that on a typical day, 4 out of every 5 students at her school eat a
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Answer:

396

Step-by-step explanation:

it's it's 396 because if you add 99 more you will get 495.

each percentage is 99, so 99 x 5 is how many students there are 99 x 4 is the answer.

7 0
3 years ago
Which of the following is a solution to 2cos2x − cos x − 1 = 0?
Pavel [41]

Answer:

Option A is correct.

Solution for the given equation is, x = 0^{\circ}

Step-by-step explanation:

Given that : 2\cos^2x -\cos x -1 =0

Let \cos x =y

then our equation become;

2y^2-y-1= 0           .....[1]

A quadratic equation is of the form:

ax^2+bx+c =0.....[2] where a, b and c are coefficient and the solution is given by;

x = \frac{-b\pm \sqrt{b^2-4ac}}{2a}

Comparing equation [1] and [2] we get;

a = 2 b = -1 and c =-1

then;

y = \frac{-(-1)\pm \sqrt{(-1)^2-4(2)(-1)}}{2(2)}

Simplify:

y = \frac{ 1 \pm \sqrt{1+8}}{4}

or

y = \frac{ 1 \pm \sqrt{9}}{4}

y = \frac{ 1 \pm 3}{4}

or

y = \frac{1+3}{4} and y = \frac{1 -3}{4}

Simplify:

y = 1 and y = -\frac{1}{2}

Substitute y = cos x we have;

\cos x = 1

⇒x = 0^{\circ}

and

\cos x = -\frac{1}{2}

⇒ x = 120^{\circ} \text{and} x = 240^{\circ}

The solution set:  \{0^{\circ}, 120^{\circ} , 240^{\circ}\}

Therefore, the solution for the given equation  2\cos^2x -\cos x -1 =0 is, 0^{\circ}





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4 years ago
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Answer:

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3 years ago
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4 years ago
2y-4=3y-5 find the y
Bingel [31]
2y-4=3y-5
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3 years ago
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