Starting at home, jessica traveled uphill to the grocery store for 18 minutes at just 20 mph. she then traveled back home along the same path downhill at a speed of 60mph.
what is her average speed for the entire trip from home to the grocery store and back?

3x + 4y -25 =0 represents the amount of change sianna should recieve

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answer: d.) the total number of protons and neutrons is 15

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i those same problems in math and dont know how to do them