uh... algebra.?

Question

1. The probility that a certain event will occur is 5/9. what are the odds that this event will occur?

2. Marika is ordering box lunches for a class picnic. A caterer tells her that 15 lunches will cost $52.20, 20 lunches will cost $70.00, and 25 lunches will cost $87.50. Write an equation to describe this relationship and use it to find the cost of 30 lunches.

Answer 1

1. The odds are 5 chances in 9. At the race track, 9-5.
2. You should always "look" at your data to spot a relation. Here, the cost per lunch is almost constant from 15 to 25 lunches, at about $ 3.80 each. So we can write y (the cost) = 3.8 x, and for 30 lunches, estimate $ 114.

Answer 2

2) First, by figuring out the cost per lunch at each price, you can calculate the rate
$52.20/15=$3.48
$70.0/20= $3.50
$87.5/25= $3.50

Now you can see that the rate is constant, or linear, where one lunch costs about $3.50. The equation that you would use is Cost (C) = $3.5Lunches (L)
Therefore, C= $3.5 * 30 where C=$105.00