On average, a person's heart beats about 4.2 x 10 to the power of 7 times per year. There are about 7,600,000,000 people in the world. Use this data to determine the approximate number of heartbeats for all people in the world per year. Expressing your answer in scientific notation in the or a x 10^b, what are the values of a and b?

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a c

step-by-step explanation:

step-by-step explanation:

what is the figure? attach a picture.

$15.40 per mile

step-by-step explanation:

you have to round up to 4 because 6 is over 5 so you have to round the 3 up to 4