Explain why the gcf of two numbers is sometimes 1

While measuring the ingredients for her pecan pie, Ashley discovered the only measuring cup she had measured 1/5. The pie calls for 3.2 cups of sugar.

Luis is 5 times as old as Tiffany and is also 40 years older than Tiffany. How old is Luis?

In the diagram, m CD = 128° and m DA = 76°. What is m∠ABC?

A swimming pool is in the shape of a rectangular prism. It holds 3,584 cubic feet of water. If the base measures 28 feet by 16 feet, how deep is the pool?

2 (x+y) / 3 for x = 6and y=7

A perfect square is the square of an integer. Of the integers from 2 through 99, how many have at least one perfect square factor > 1?

0.2 with an exponent of 4

Marco is selling floral arrangements. Each arrangement uses 1 vase and 11 orchids. Each case cost Marco $4.00. Let C be the total cost of the arrangement and r be the cost of 1 orchid. Which equation should Marco use to find the total cost A.

Ken's contest entry, why honesty is important must be 100 words or less. Ken gets about six words on one line of his notebook paper. About how many lines can he write without going over the 100 word limit.

Lin bought 3 hats for $22.50. At this rate, how many hats could she buy with $60.00?