The bar chart gives information about the numbers of students in the 4 classes of year 11 in a school. There are 65 year 11 students in total. Work out what percentage of year 11 students are in class 11A?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

22. catie is starting a babysitting business. she spent $26 to make signs to advertise. she charges an initial fee of $5 and then $3 for each hour of service. write and solve an inequality to find the number of hours she will have to babysit to make a profit. interpret the solution.!

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota