I need help plzzz plzzz help me I need the answers

If the measure of xyz is 81 what is the measure of yz

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 expression is equivalent to the square root of 2 multipllied by 5 divided by 18