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2 years ago

15

Without computing, how do you know that the answer to 7-(-15) is posotive?

1 answer:

kkurt [141]2 years ago

8 0

Hello, and thank you for posting your question here on brainly.

We have a trick in my school named "the cupid rule", where if you're subtracting a negative that's in parenthesis, we put a ♥ over the two negatives, and turn it into a positive, so now it's 7 + 15.

(it's 22)

Hope this helps! ☺♥

2 years ago

this is not brainly lol

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Answer:

Step-by-step explanation:

Let age of each twin be x

let age of sister be s

So we can write:

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This can be simplified as:

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We replace s with "x + 4" and solve:

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Thus, we can say the twins are 14 years old

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2 years ago

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3 years ago

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