Answer:
A- 8,900,000,000
B- 8.9 x 10^9
Explanation:
(a) The approximate number of 20-dollar bills in circulation in standard notation is 8,900,000,000. This means there are 8.9 billion 20-dollar bills in circulation. To write it in standard notation, we simply write out the number as it is.
(b) The number of bills in scientific notation is 8.9 x 10^9. Scientific notation is a way to write very large numbers using powers of 10. In this case, the number 8.9 is multiplied by 10 raised to the power of 9. This means we move the decimal point 9 places to the right. So, 8.9 x 10^9 is equal to 8,900,000,000.
To calculate the value of all the 20-dollar bills in circulation, we need to multiply the number of bills by the value of each bill, which is $20. So, we multiply 8.9 billion by $20:
Value = 8,900,000,000 x $20 = $178,000,000,000.
Therefore, the value of all the 20-dollar bills in circulation is $178 billion in standard notation.