Three observation posts P,Q and R are such that Q is due east of P and R is due north of Q. If |PQ| = 5km and |PR| = 10km, find |QR|

Evaluate \(log_{10}5 + log_{10}20\)

If N varies directly as M and N = 8 when M = 20 find M when N = 7

Express 0.0462 in standard form

A boy estimated his transport fare for a journey as N190 instead of N200. Find the percentage error in his estimate

In a class of 80 students, every students studies Economics or Geography or both. If 65 students study Economics and 50 study Geography, how many study both ...

Which of the following correctly expresses 48 as a product of prime factors?

Evaluate \((20_{three})^2 - (11_{three})^2\) in base three

In a bag of oranges, the ratio of the good ones to the bad ones is 5:4. If the number of bad oranges in the bag is 36, how many oranges are there in the alto...