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15x + 8 = 53

15x = 53-8 = 45

x = 45/15 = 3

B. Brötchen

1. We currently have 80% of the original price and aim to find 100%.

2. We know that 80% is equal to £29.40.

3. Dividing £29.40 by 80 gives the value of 1% which is £0...

1. We aim to factorise the numerator. This would give 6c(c^2 + 5).

2. We then factorise the denominator. This would give 3(c^2 + 5).

3. Since (c^2 + 5) is present in b...

The pH of a particular substance depends on the functional groups that it has within its structure. What is a functional group? A functional group is a group of atoms and bonds within a molecule. The way ...