HELP ME PLEASE

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

The length of the largest fish is 967.74 times greater than the length of the smallest fish. select a variable expression that shows the length of the largest fish, if 8 is the length of the smallest fish. a. s + 967.74 b. \[ \frac{967.74}{s} \] c. 967.74 - s d. 967. 74s

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes