7. A group of students takes their math teacher out for lunch. If five have hamburgers and four have hot dogs, the bill will be $19.50. If four have hamburgers and five have hot dogs, the bill will be $18.75.
What is the price of a hamburger and a hot dog?

Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is d if c c' = 12 and d' = 0.50? a) 3 b) 6 c) 12 d) 24

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Reflect the point (7,0) across the y-axis