You need to know these two formulas:

For example,

The simplified expression should be
ab(5+9-1)
once factorized
Answer:
7.8% include tax
Step-by-step explanation:
that is the price
Answer:
3/64
Step-by-step explanation:
Multiply straight across the numerators and then denominators
3 1 3
------- X ---------- = ---------
8 8 64
Answer:
Step-by-step explanation:
A, B and C must be real numbers, and A and B are not both zero (which would cause division by zero in the calculation of the slope).