3 years ago

Exercise 2

1 answer:

6 0

1. C - multiply 4 and 6 first
2. C - multiply 5 and 3 first
3. B - subtract 8 and 2
4. B - subtract 19 by 3
5. B - multiply 32 and 4

Hope this helps

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My brainy brother and sister added their ages together and got 15. When they multiplied their ages together, they got 54. How ol

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Given:

Sum of ages of brother and sister = 15

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To find:

How old is the older one between the two of them?

Solution:

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$0=54-15y+y^2$

Splitting the middle term, we get

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Using zero product property, we get

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If $y=9$ , then using (i), we get

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