Paisley has x number of dimes and y number of nickels for a total of 18 coins. knowing that a dime is worth ten cents and a nickel is worth five cents, she wrote the system of equations below because she had a total of $1.40. is her system correct? if not, then why?

x + y = 18

0.1x + 0.05y = 1.40

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126

Combine the information in the problem and the chart using the average balance method to solve the problem.

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.