Can someone me with this , i don't understand

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.

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16