ALGEBRA
Simplify the expressions 3x + 5y - x + 2y
2x + 7y
Expand the bracket: 4( 3x - 5)
12x - 20
Solve the equation 5x - 3 = 17
x = 4
Solve the equation 3 (x + 4) = 2 x + 15
x = 3
Factorise the expression completely: 6 x² + 15x
3x (2x + 5)
The n-th term of a sequence is given by n² - 3. What are the first three terms of this sequence?
-2, 1, 6
An exterior angle of a regular polygon is 40°. How many sides does this polygon have?
9 sides
Since the sum of exterior angles is always 360°, 360 ÷ 40 = 9
Calculate 2 1/4 ÷ 3/8. Give your answer as a whole number
Answer: 6
Rearrange the formula y = 3x - 7 to make x the subject
x = (y + 7)/3