Nicole purchased a prepaid phone card for $50.25. Calls cost 25 cents a minute using this card. The credit, C (In dollars), left on the card after it is used for X minutes of calls is given by the following.
C=50.25 -0.25%
How much credit is left on the card after Nicole uses it for 30 minutes of calls?
Idollars
5
?

Regular price is $77.00 and the discount is 5% find the sale price

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.

Which one is the correct answer, and why?