Find the x and z intercepts of the graph of 3x - z \(\leq\) 9

Find the total surface area of a cylinder of base radius 5cm and length 7cm ( π = 3.14)

If x + y = 90 simplify \((sinx + siny)^2\)−2sinxsiny

A man with an annual salary of N2000, has allowances of N600. If Income Tax is 5%. How much income tax expenses does he pay each year?