Josie spots her brother Dan from the roof of a block of flats. The angle depression from Josie to Dan is 45 degrees. The distance from Josie directly to Dan is 80 metres. Calculate the height of the block of flats. Give your answer correct to 2 decimal places.

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.

The slope of the line passing through the points (2, 7) and (-4, 8) is

How many dollars more is the price of a pie than the price of a doughnut at erik’s store