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3 years ago

9

Find the value of x. 31.7, 42.8, 26.4, x, mean 35

1 answer:

Troyanec [42]3 years ago

6 0

Answer:

x = 39.1

Step-by-step explanation:

mean = average off all the numbers =

sum of the numbers / amount of numbers.

35 = sum of the #'s / # of #'s

35 = 100.9 + x / 4

35 × 4 = 100.9 + x / 4 × 4

140 = 100.9 + x

140 – 100.9 = 100.9 + x – 100.9

39.1 = x

x = 39.1

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4 years ago

Read 2 more answers

What is the sum ? (2x^2-4x+1)+(5x+x^2-1)

Ipatiy [6.2K]

$Hello$ $There!$

<u>The answer is...</u>

<u />

<u /> $3x^2+x$ <u />

<u />

HERE'S A EXPLANATION!

$2x^2-4x+1+5x+x^2-1$

$=2x^2+-4x+1+5x+x^2+-1$

<u>Combine these like terms!</u>

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<u></u> $=2x^2+-4x+1+5x+x^2+-1$ <u></u>

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3 years ago

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Given

<em><u>=</u></em><em><u>></u></em><em><u> </u></em><em><u>An </u></em><em><u>equation</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>9</u></em><em><u>x</u></em><em><u>-</u></em><em><u>1</u></em><em><u>=</u></em><em><u>-</u></em><em><u>1</u></em><em><u>1</u></em>

To Find

<em><u>=</u></em><em><u>></u></em><em><u> </u></em><em><u>The </u></em><em><u>value</u></em><em><u> </u></em><em><u>of </u></em><em><u>x</u></em>

Step-by-step explanation:

<em><u>9</u></em><em><u>x</u></em><em><u>-</u></em><em><u>1</u></em><em><u> </u></em><em><u>=</u></em><em><u>-</u></em><em><u>1</u></em><em><u>1</u></em>

<em><u>9</u></em><em><u>x</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>-</u></em><em><u>1</u></em><em><u>1</u></em><em><u>+</u></em><em><u>1</u></em>

<em><u>9</u></em><em><u>x</u></em><em><u> </u></em><em><u>=</u></em><em><u>-</u></em><em><u>1</u></em><em><u>0</u></em>

<em><u>x </u></em><em><u>=</u></em><em><u>-</u></em><em><u>1</u></em><em><u>0</u></em><em><u>/</u></em><em><u>9</u></em>

or

<u>-</u><u>1</u><u>.</u><u>1</u><u>1</u>

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4 years ago

A picture inside a frame is 2 inches longer than it is wide. The picture is in a frame that has a width of 3 inches on each side

geniusboy [140]

Answer:

The dimensions of the frame are 15 in x 13 in

Step-by-step explanation:

Let

x ----> the length of the picture

y ----> the width of the picture

we know that

$x=2+y$ -----> equation A

The area of the picture, including the frame is

$A=(x+6)(y+6)$

$A=195\ in^2$

so

$195=(x+6)(y+6)$ ----> equation B

substitute equation A in equation B

$195=(2+y+6)(y+6)$

solve for y

$195=(y+8)(y+6)\\y^2+6y+8y+48=195\\\\y^2+14y-147=0$

solve the quadratic equation by graphing

The solution is y=7 in

see the attached figure

<em>Find the value of x</em>

$x=2+7=9\ in$

Find the dimensions of the frame

$x+6=9+6=15\ in$

$y+6=7+6=13\ in$

therefore

The dimensions of the frame are 15 in x 13 in

7 0

3 years ago