Matthew wants his run today to take no more than 90 minutes. He already has run 30 minutes at a pace of 10 minutes per mile.
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we are given
we can see that
each terms are multiple of 2
so, we can factor out 2
we can divide both sides by 2
we can rearrange it
now, we can move 10 on right side
now, we can add both sides 7^2 and 5^2
we can simplify it
we can also write as
..............Answer