RRB Government Jobs Exams

Southern Phone Company is promoting a new cell phone service plan: a customer can make up to 500 minutes of calls each month for $39.99. If the number of minutes used in a month exceeds 500, then the function c = 0.40(m - 500) + 39.99 describes the monthly charge, c, in dollars in terms of m, the total number of minutes used. Which of the following statements best describes this function?

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RRB Other Question
Which of the following relations is a function?
a) I, II, and III only
b) I and II only
c) II and III only
d) III and IV only In the quadratic equation x^2 - x + c = 0, c represents an unknown constant. If x = -3 is one of the solutions to this equation, what is the value of c?