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14)

Patterns are made using straight lines and arcs.

a)

More rows are added to

**Pattern B**so thatnumber of straight lines : number of arcs = 10 : 9

How many rows are added?

**[2 marks]**

b) A different pattern is made using 20 straight lines and 16 arcs.

The straight lines and arcs are made from metal.

- 20 straight lines cost £12
- cost of one straight line : cost of one arc = 2 : 3

Work out the

**total**cost of the metal in the pattern.

**[3 marks]**