13. The price of a telephone was first increases by 10 percent and then the new price was decreased bu 25 percent. The final price was what percent of the initial price?
(A) 78%
(B) 80%
(C) 82.5%
(D) 85%
(E) 87.5%

14.When the number \[w\] is multiplied by \[4\], the result is the same as when 4 is added to \[w\]. What is the value of \[3w\]?
(A) \[\frac{3}{4}\]
(B) \[1\]
(C) \[\frac{4}{3}\]
(D) \[3\]
(E) \[4\]

15. The lengths of the the sides of a right triangle are consecutive even intergers, and the length of the shortest side is \[x\]. Which of the following eequations could be used to find \[x\]?
(A) \[x + x + 1 = x + 2\]
(B) \[x^2 + (x + 1)^2 = (x + 2)^2\]
(C) \[x^2 + (x + 2)^2 = (x + 4)^2\]
(D) \[x + x + 2 = x + 4\]
(E) \[x^2 = (x + 2)(x + 4)\]

16. If \[x\] is an integer greater than 1 and if \[y = x + \frac{1}{x}\], which of the following must be true?
I. \[y # x\]
II. \[y\] is an integer.
III. \[xy > x^2\]
(A) I only
(B) II only
(C) I and II only
(D) I and III only
(E) I, II and III

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