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dimulka [17.4K]
2 years ago
7

If a = b /c-b , find the value of b when a = 3 and c = 10 *

Mathematics
1 answer:
irina [24]2 years ago
5 0

Answer:

15

Step-by-step explanation:

a+b=8 becomes a=8-b

b+c=10 becomes b=10-c

c+a=12 becomes c=12-a

Now subtract two of the equations that contain the same variable. I’ll pick two that contain an a: c+a =12 & a+b=8. Subtracting the latter from the former eliminates the “a”s, leaving c-b=4. Adding b to both sides to isolate c gives c=b+4. From above we can take b=10-c to substitute for b in c=b+4, giving us c=(10-c) + 4). Simplify the right side to c=14-c, add c to both sides, giving 2c=14, & then divide both sides by 2 to obtain c=7.

Replace the c in b=10-c with 7 to have b=10–7, so that b=3.

You can choose which a to solve for. I’ll select a+b=8, substituting 3 for b to have a+3=8, subtract 3 from both sides, gives us a=5.

Finally add 5+3+7 together to find that a+b+c=15.

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Answer:

c = 5

Step-by-step explanation:

Distribute the left side and compare like terms with the right side.

- 2x³(cx³ + x²) = - 2cx^{6} - 2x^{5}

Compare to - 10x^{6} - 2x^{5}

For the 2 sides to equate then

- 2cx^{6} = - 10x^{6}

Hence c  = \frac{-10}{-2} = 5

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3 years ago
F(x)=x g(x)=1<br> What is the domain of (f/g)(x)?
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1

Step-by-step explanation:

f(g(x)) = 1, therefore the domain is 1

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wolverine [178]

Answer:

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2 years ago
George and Paul use a metal alloy that is 18.1% copper to make jewelry. How many ounces of an alloy that is 14% copper must be m
ella [17]

Answer:

Use 49 ounces of the 14% allow and 41 ounces of the 23% alloy.

Step-by-step explanation:

Each ounce of the 14% copper contains 0.14 ounce of pure copper.

Each ounce of the 23% copper contains 0.23 ounce of pure copper.

Each ounce of the 18.1% copper contains 0.181 ounce of pure copper.

Use x ounces of the 14% and y ounces of the 23% to make 90 ounces of 18.1% alloy.

x+y  = 90

y = 90-x

0.14x + 0.23y = 0.181·90

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0.14x + 20.7 - 0.23x = 16.29

-0.09x + 20.7 = 16.29

4.41 = 0.09x

x = 49

y = 90-x = 41

Use 49 ounces of the 14% allow and 41 ounces of the 23% alloy.

7 0
2 years ago
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