1 EASY Given x = 13, y = 1, which of these is an equivalent expression? x $$+$$ 13 = y $$+$$ 1x $$-$$ 1 = y $$-$$ 13x $$\div$$ 1 = y $$\div$$ 13x $$\times$$ 1 = y $$\times$$ 13x $$-$$ 1 = y $$+$$ 13

 2 EASY If a gold coin is worth $60 and a silver coin is worth$12, then which of the following is true? A gold coin is worth as much as 4 silver coins.A gold coin is worth as much as 5 silver coins.A gold coin is worth as much as 6 silver coins.A silver coin is worth as much as 6 gold coins.A silver coin is worth as much as 12 gold coins.

 3 MEDIUM Bob makes 18 dollars an hour for making birthday cakes. Timmy makes 16 dollars an hour by babysitting kids. Which of the following is true? The amount of money Bobby makes in 7 hours is equal to the amount of money Timmy makes in 8 hours.The amount of money Bobby makes in 8 hours is equal to the amount of money Timmy makes in 7 hours.The amount of money Bobby makes in 9 hours is equal to the amount of money Timmy makes in 8 hours.The amount of money Bobby makes in 8 hours is equal to the amount of money Timmy makes in 9 hours.The amount of money Bobby makes in 9 hours is equal to the amount of money Timmy makes in 7 hours.

 4 HARD If $$x = 9, y = x + 12, z = 2y - 1$$, find the value of $$a$$, given: $$3x + 5y - az = 50$$ 00.511.52

 5 HARD If a = 1, b = 2, c = 3, d = 4, ..., z = 26, which of the following is true? z - y - x - ... - c - b - a = 0z - y + x - w + ... - c + b - a = 0z + y + x + ... + c + b + a = 26z - y + x - w + ... - c + b - a = 26a - b + c - d + e - f + ... + y - z = 26