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iren [92.7K]
3 years ago
15

Question 10. Simplify the expression. (x^2 - 9)/(x^2 + 2x - 15)

Mathematics
1 answer:
krek1111 [17]3 years ago
3 0

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Answer:

c = 0.5 cm

Step-by-step explanation:

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c = 0.2588 * 2 / 0.9659  

c = 0.5 cm

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Three times one number added to five times another number is 54. The second number is two less than the first. Use a system of e
worty [1.4K]

Answer:

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Step-by-step explanation:

If you use x for the first number, and y for the second, you get equations of 3x+5y=54 and x-2=y.

You can substitute the second equation into the first one to solve it. This gives 3x+5(x-2)=54.

The brackets can be expanded to 3x+5x-10=54. Collecting like terms makes it 8x-10=54.

Next, we add 10 to both sides. This gives 8x=64.

From there, we isolate the x by dividing both sides by 8, giving x=8.

To work out the second number, we can sub 8 for x in either equation (I'm using the second one as it's simpler).

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**This content is simultaneous equations, which you may wish to revise. I'm always happy to help!

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