Geometry question 3, Thanks if you help!

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.

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Askateboard ramp is in the shape of a right triangle what is the height of the ramp