The total surface area of the walls of a room, 7m long, 5m wide and xm high is 96m². Find the value of x

Simplify $\frac{2}{3xy}-\frac{3}{4yz}$

A regular polygon has 9 sides. What is the size of one of the its exterior angles?

The salary of a man was increased in the ratio 40: 47. Calculate the percentage increase in the salary

A train moving at uniform speed, covers 36km in 21 minutes. How long does it take to cover 60km

P = {3, 9, 11, 13} and Q = {3, 7, 9, 15} are subsets of the universal set  ξ = {1, 3, 7, 9, 11, 13, 15}. Find $P'\cap Q'$

Which of the following statement describes the locus of a point R which moves in a plane such that it is equidistant from two intersecting lines?