Find the range of the following set of numbers: 28, 29, 39, 38, 33, 37, 26, 20, 15, and 25.

The fourth and eighth terms of an Arithmetic Progression are 16 and 40 respectively. Find the common difference.

For what values of y is \(\frac{y + 2}{8y^2 - 10y  +  3}\) not defined?

The time(t) taken to buy fuel at a filling station varies directly as the number of vehicles(V) in a queue and varies inversely as the number of pumps (P), available at the station. In a station with 5 pumps, it took 10 minutes to fuel 20 vehicles. find the;

(a) relationship between t, P, and V;

(b) time it takes to fuel 50 vehicles at a station with 2 pumps;

(c) number of pumps required to fuel 40 vehicles in 20 minutes.

A car travelled at a distance of  (2x + 13) km at 67.5 km/h and (5x − 20) km at 72 km/h. If the total time for the entire journey was 90 minutes, find the value of x.