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3 years ago

8

Aaron is 5 years older than Bronwyn, Carl is 7 years older than Aaron and the sum of all their ages is 53 years. How old is Bron

wyn?

1 answer:

Brut [27]3 years ago

3 0

Bronwyn equals to 12
Aaron equals to 17
And Carl is 24
Do you want me to explain?

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Dos anyone know how much a is 2(a+7)-7=9

Oduvanchick [21]

Answer:

a =1

Step-by-step explanation:

2(a+7)-7=9

Add 7 to each side

2(a+7)-7+7=9+7

2(a+7)=16

Divide by 2

a+7 = 16/2

a +7 = 8

Subtract 7

a+7-7 = 8-7

a = 1

3 0

4 years ago

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What value is equivalent to 13 − 2(1 − 15) ÷ 4? A) -38.5 B) -26 C) 7.25 D) 20

Klio2033 [76]

Answer:

D. 20

Step-by-step explanation:

13 - 2 (1-15) ÷ 4

First deal with whatever in the parentheses

13 - 2 (-14) ÷ 4

Multiply and divide from left to right

13 - (-28) ÷ 4

13 - (-7)

The negatives would cancel so add 13 and 7 to get 20

5 0

4 years ago

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Set A of six numbers has a standard deviation of 3 and set B of four numbers has a standard deviation of 5. Both sets of numbers

Alenkinab [10]

Given:

$\sigma_A=3$

$n_A=6$

$\sigma_B=5$

$n_B=4$

$\overline{x}_A=\overline{x}_B$

To find:

The variance. of combined set.

Solution:

Formula for variance is

$\sigma^2=\dfrac{\sum (x_i-\overline{x})^2}{n}$ ...(i)

Using (i), we get

$\sigma_A^2=\dfrac{\sum (x_i-\overline{x}_A)^2}{n_A}$

$(3)^2=\dfrac{\sum (x_i-\overline{x}_A)^2}{6}$

$9=\dfrac{\sum (x_i-\overline{x}_A)^2}{6}$

$54=\sum (x_i-\overline{x}_A)^2$

Similarly,

$\sigma_B^2=\dfrac{\sum (x_i-\overline{x}_B)^2}{n_B}$

$(5)^2=\dfrac{\sum (x_i-\overline{x}_B)^2}{4}$

$25=\dfrac{\sum (x_i-\overline{x}_B)^2}{4}$

$100=\sum (x_i-\overline{x}_B)^2$

Now, after combining both sets, we get

$\sigma^2=\dfrac{\sum (x_i-\overline{x}_A)^2+\sum (x_i-\overline{x}_B)^2}{n_A+n_B}$

$\sigma^2=\dfrac{54+100}{6+4}$

$\sigma^2=\dfrac{154}{10}$

$\sigma^2=15.4$

Therefore, the variance of combined set is 15.4.

7 0

3 years ago

Please help me I need the answer for this question. correct one please

andreyandreev [35.5K]

Answer:

B

Step-by-step explanation:

Because to find out if two triangles are similar you need an ASA which can help determine if they are similar or not.

7 0

3 years ago

Multiply or divide as indicated.<br> 10x^5 divide 2x^2

kenny6666 [7]

Answer:

5x^3(to the power of 3)

Step-by-step explanation:

10x^5/2x^2

divide the 10/2 like normal to get 5

x^5/x^2 (subtract the powers 5-2 when dividing powers)

you would get 5x^3

3 0

3 years ago