David lost 15 dollars from his pocket. Write a signed number to represent this change.

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 function models the number of accidents per 50 million miles driven as a function

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39