omar2334
20.10.2020 •
Mathematics
On average, a person’s heart beats about
4.2
×
1
0
7
4.2×10
7
times per year. There are about
7
,
600
,
000
,
000
7,600,000,000 people in the world. Use this data to approximate the number of heartbeats for all the people in the world per year. Expressing your answer in scientific notation in the form
a
×
1
0
b
a×10
b
, what are the values of
a
a and
b
b?
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Ответ:
4
Step-by-step explanation:
No.of people play sports= 1/3 of 30
=1 x 10 = 10
So, 10 people play sports
Now, 2/5 out of 10 people play soccer
Therefore, the question will be
2/5 out of 10
= 2x2 = 4