RRB Government Jobs Exams

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

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RRB Other Question

The sales tax rate at a clothing store is 8.75%. Sales tax on an item is a function of its price. Which of the following is the dependent quantity in this function?
a) The sales tax rate on the item
b) The items price
c) The amount of sales tax on the item
d) The items size 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?