14 over 21 simplified

Which statement about perfect cubes is true

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.