Pablo drive 23.1 miles to his aunts house, then drove 19.24 miles to his friends house. Which estimate can Pablo use to determine the distance he drove altogether?

2+19=21 miles

23+19=42 miles

23+192=. 215 miles

231+1924=2155 miles

How do I solve 2x-3y=-1 and y=x-1 with substitution?

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75% of b is 12. What is b?

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What does the ratio 2:1 mean?

Estimate the difference by rounding off to nearest tens. 6723 - 751

Who invented the square root of negative one?