Why do we need to measure mass

Write a story that matches with the expression 42x-5 pls hurry

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 center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.