Factorise the following:
a) x + 3x - 4
b) x - 2x - 3
c) x + 2x - 8

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

The function show two sisters' savings account and the rate at which they plan to deposit money