Three houses are sold for: £187000, £253000 and £141000
The company earns 2% commission on
each house.
What is the total commission earned?

Aquadratic function f(x) has a turning point at (3,-7). what is the turning point of -f(x)?

Suppose that in 2008 , 840,800 citizens died of a certain disease assuming the population of teh country is 399 miliion, what is the mortality rate in units of deaths per 100,000 people?

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.