PLZ HELP QUICK

Select all the correct answers. What is 221,000,000,000,000,000,000 expressed in scientific notation?

2.21 × 10^21

2.21E20

2.21E21

2.21E-20

2.21 × 10^-21

2.21 × 10^-20

2.21 × 10^20

2.21E-21

2.21E20

2.21 × 10^20

Step-by-step explanation:

The decimal point has to go 20 places to the left to give the number 2.21; that means the exponent on the 10 is 20.

2.21E20

2.21 × 10^20

okay so 15.15 *()5: +5/6

step-by-step explanation:

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