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Arithmetic Problems please

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Yziid
40 is what percent of 800?
add and simplify 7/10 + 5/8 + 7/20
subtract: 8.02 - 3.696
divide and simplify: 15/2 divided by 3
a car traveled 200 mi. on 12 1/2 gal. of gas, how may miles per gallon did get it?
I hope this helps you :)
SPDCid
What is the 24th term of an arithmetic sequence if the first term is -3 and the common difference is -5?

The formula is an=a1+(n-1)d

a24= -3 + (24-1) (-5)
a24= -3 + (23) (-5)
a24= -118