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3 years ago

Two-thirds of a number added to itself is 20. What is the number?

Mathematics

1 answer:

vivado [14]3 years ago

8 0

Answer:

Step-by-step explanation:

2/3 x + x = 20

2/3 x + 3/3x = 20

5/3 x = 20 ... times 3/5 both sides

x = 12

check: 2/3 x 12 + 12 = 8 + 12 = 20

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What is the solution to 5-2x^2=-15?

Phantasy [73]

Isolate x.

-2 $x^{2}$ =-20
$x^{2}$ =10
x= $\sqrt{10}$

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3 years ago

Help please

erastovalidia [21]

A = a+b/ 2 h the / is a fraction btw.

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2 years ago

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if angle A and angle B are supplementary, and angle A and angle C are supplementary. What conclusion is valid

Iteru [2.4K]

Answer:

Angle B and C are congruent.

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2 years ago

Question 1

Vitek1552 [10]

Answer:

$M.A.D= 4.9$

Step-by-step explanation:

Given

12.7, 22, 23.5, 24, 11, 22

Required

Determine the M.A.D

Start by calculating the Mean

$Mean = \frac{\sum x}{n}$

In this case, n = 6

So:

$Mean = \frac{12.7 + 22 + 23.5 + 24 + 11 + 22}{6}$

$Mean = \frac{115.2}{6}$

$Mean = 19.2$

Subtract the mean from each element

$12.7 - 19.2 = -6.5$

$22 - 19.2 = 2.8$

$23.5 - 19.2 = 4.3$

$24 - 19.2 = 4.8$

$11 - 19.2 = -8.2$

$22 - 19.2 = 2.8$

Take absolute value of the results above

$|-6.5| = 6.5$

$|2.8| = 2.8$

$|4.3| = 4.3$

$|4.8| = 4.8$

$|-8.2| = 8.2$

$|2.8| = 2.8$

The mean of the above gives the MAD

$M.A.D= \frac{\sum |x - u|}{n}$

$M.A.D= \frac{6.5 + 2.8 + 4.3 + 4.8 + 8.2 + 2.8}{6}$

$M.A.D= \frac{29.4}{6}$

$M.A.D= 4.9$

7 0

3 years ago

3/41 40/97 1/6 in least to greatest?

postnew [5]

Answer:

3/41; 1/6 40/97

Step-by-step explanation:

3 0

3 years ago