**1** Which relation is not a function?

(1) *y* = 2*x* + 4 (3) *x* = 3*y *- 2

(2) *y* = *x*^{2} - 4*x *+ 3 (4) *x* = *y*^{2}+2*x *- 3

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**2** The solution set of |3*x* + 2| < 1 contains

(1) only negative real numbers

(2) only positive real numbers

(3) both positive and negative real numbers

(4) no real numbers

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**3** In the accompanying diagram, cabins *B* and *G* are located on the shore
of a circular lake, and cabin *L* is located near the lake. Point *D* is a dock
on the lake shore and is collinear with cabins *B* and *L*. The road between
cabins *G* and L is 8 miles long and is tangent to the lake. The path between
cabin *L* and dock *D* is 4 miles long.