At a local Zoo a child ticket costs $8.50 and an adult ticket costs $12.50. On one weekend in June they sold a total $1,374 worth of tickets. A total of 140 tickets were sold. Write a system of equations that can be used to find how many of each ticket was sold?

Which equation represents the partial sum of the geometric series?

Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n