Find the sum of the convergent series 7 0.7 0.007

Which expression is equivalent to the expression shown?

What is the value of the discriminant of the quadratic equation -2x = -8x + 8 and what does its value mean about thenumber of real number solutions the equation has?

At your job you're paid $50 per week plus $3 per sale at least how many saled do you need to make in order to have over $250