(help its due in 40 minutes) value of x is the value of the expression 5x - 1 a prime number? what is x HELP PLEASE

Someone answer asap for ! michele pushes a box d meters across a floor. she uses a force f, in newtons, to push the box. she pushes the box for t seconds. the formula p = fd/t calculates the power, p, in watts, that it takes for michele to complete the task. solve the formula for d.