It costs $x for four adults’ tickets. a child’s ticket costs $3 less than an adult’s ticket. on family night, all the tickets go for half price. develop a formula in terms of x to calculate how much it will cost for a family of 2 adults and 3 children on family night.

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.