What is the LCM of 20 an 11

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.

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

The radius of a sphere is 3 inches. which represents the volume of the sphere?