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solmaris [256]
3 years ago
11

C.6 D.5 Geometry math question no Guessing

Mathematics
1 answer:
Katena32 [7]3 years ago
3 0

Set up a ratio 50 / 130 = x+19 / 78

Cross multiply:

50 * 78 = 130 * x+19

3900 = 130(x+19)

Use the distributive property:

3900 = 130x + 2470

Subtract 2470 from each side:

1430 = 130x

Divide both sides by 130

x = 1430 / 130

X = 11

The answer is B. 11


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3 years ago
Rename the number 120,000= ? Ten thousands
galben [10]
12,000 is that what you mean .

5 0
4 years ago
Jim and Sarah invited seven friends over for dinner. If each friend brought one guest how many people will be at the dinner excl
Vanyuwa [196]

16 people would be at the dinner because Jim and Sarah invited 7 friends and each friend brought 1 guest, so you do 7*2=14 and the 14 + Jim and Sarah=16 people.

7 0
3 years ago
sophia is 6 years older than her brother eric. the sum of their ages is 28. write and solve an equation to find sophia and Eric'
zimovet [89]

s = 6 + e

s + e = 28

We can use this system of equations to find the exact values of s and e.

We have a current value of s, so we can find the exact value of e now.

e + e + 6 = 28

<em><u>Combine like terms.</u></em>

2e + 6 = 28

<em><u>Subtract both sides by 6.</u></em>

2e = 22

<em><u>Divide both sides by 2.</u></em>

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Now we have an exact value of e, and can solve for the value of s.

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Sophia is 17 years old, and Eric is 11 years old.


6 0
3 years ago
What’s the answer to m/3-2m/5=1/5
natta225 [31]

Answer:

m = - 3

Step-by-step explanation:

\frac{m}{3} - \frac{2m}{5} = \frac{1}{5}

It is much easier to work with whole numbers, compared to fractions, hence one should remove the denominator of the fraction. This can be done by multiplying by the LCM (least common multiple). In this case, it is fairly obvious that the LCM of 3 and 5 is 15. Therefore multiply the entire equation by 15.

15*\frac{m}{3} - 15*\frac{2m}{5}=15*\frac{1}{5}

Simplify

5m-6m=3

-m=3\\m=-3

3 0
3 years ago
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