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What is 6 miles in 2 hours as a unit rate?
6 mph over 2 hours is 3 miles an hour. Or 1 mile every 20 minutes. Not sure what is meant by a unit rate?
Average size of 13 year old?
If you meant height the average is somewhere in the 5 foot region. If you meant that about guy stuff then around 3-4 inches erect if you've hit puberty.
What graphs are most effective at displaying data that changes over time?
Line graphs are meant for rate that change over time so go with that
Find A if 8300 is invested for 3 years at a single interest rate of 15 percent?
Interest = 83 x 3 x 15 = 3735. This is assuming you meant "simple" interest. If it is a one-off interest rate then the term is irrelevant and interest is 83 x 15 ie 1245
What is the origin of the idiom to hit the mark?
More than likely, this idiom comes from archery and shooting. Being good with guns and projectile weapons is referred to as having "good marksmanship." So it means you hit what you aim to hit. So as an idiom, if you say something exactly as intended and your audience understands it the way you meant it, and you strike something your audience believes to be true, then you hit your mark.
