Find two positive numbers whose difference is 7 and whose product is 2438.

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.

Anyone know these questions? i need ,.

2f(x)= x+3 if 4 < x < 8 2x if x 28 2