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?

Step-by-step explanation:

A person heart beats is 4.2 x 10∧7

there are 7,600,000,000= 7.6 x 10∧9

the heartbeats for all the people here on earth= 4.2 x 10∧7 x 7.6 x 10∧9

choosing like terms

4.2 ×7.6×10∧7×10∧9

31.92x10∧(7+9)

31.92×10∧16

a=31.92

b=16

y=x+9

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