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11111nata11111 [884]
3 years ago
8

Can some one help with two questions

Mathematics
1 answer:
sveta [45]3 years ago
7 0

Answer:

  1. -4(3x + 6)
  2. (5 - 5)x

Step-by-step explanation:

These are fairly easy to see when each expression is put into the same simplified form.

<h2>1.</h2>

-6(2x -4) = -12x +24

-(12x -6) +18 = -12x +24

-3(4x -3) +15 = -12x +24

-4(3x +6) = -12x -24 . . . . not equivalent

<h2>2.</h2>

-5(x -1) = -5x +5

-5x +5 = -5x +5

5 -5x = -5x +5

(5 -5)x = 0 . . . . not equivalent

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Find (fog)(x) and (gof)(x) f(x) = 8x-5, g(x) = 10 - 2x<br><br><br><br><br>help please ​
igomit [66]

Answer:

(fog)(x) = f( \: g(x) \: ) \\  = 8(10 - 2x) - 5 \\  = 80 - 16x - 5 \\  =  - 16x + 75

(gof)(x) = g( \: f(x) \: ) \\  = 10 - 2(8x - 5) \\  = 10 - 16x + 10 \\  =  - 16x + 20

I hope I helped you^_^

8 0
3 years ago
(64 / 8 + 2 - 10) + (9 x 9 + 19) = 2 points 100 90 99
nordsb [41]

Answer:

Answer is 100

Step-by-step explanation:

(64/8+2-10) + (81+19)

(8+2-10) + (81+19)

(10-10) + (100)

(0) + (100)

0+100

100

7 0
2 years ago
450 high school freshmen were randomly selected for a national survey. Among survey participants, the mean grade-point average (
umka21 [38]

Answer:

The margin of error is of 0.01.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.7}{2} = 0.15

Now, we have to find z in the Z-table as such z has a p-value of 1 - \alpha.

That is z with a pvalue of 1 - 0.15 = 0.85, so Z = 1.037.

The margin of error is of:

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

Standard deviation was 0.21.

This means that \sigma = 0.21

Sample of 450:

This means that n = 450

What is the margin of error, assuming a 70% confidence level, to the nearest hundredth?

M = z\frac{\sigma}{\sqrt{n}}

M = 1.037\frac{0.21}{\sqrt{450}}

M = 0.01

The margin of error is of 0.01.

4 0
3 years ago
Can anyone help me with this question? <br>what is 6y+8x=24
Effectus [21]

so you will have to convert it to slope intercept form which is y=mx+B so you will have to isolate the y

6y+8x=24 subtract 8x to both sides

6y=-8x+24

divide 6 by both sides

y= -8/6x + 4

simplify

y= -4/3x + 4

the slope of the line is -4/3

8 0
3 years ago
A circle has a diameter of 7.2 inches.
navik [9.2K]

Answer:

22.6 inches

Step-by-step explanation:

The circumference of a circle is given by

C = pi *d

The diameter is 7.2 inches

Approximating pi by 3.14

C = 3.14 * 7.2

C = 22.608

Rounding to the nearest tenth

C = 22.6

7 0
3 years ago
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