Find the derivative of y=1/x using the first principle

What is the value of x? enter your answer in the box. (cm)

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.

Find the nonpermissible replacement for binthis expression.b2/5b +5