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1)

a) cost (in £) = 75 + 10

b) £225

c) 12

2)

Me =

David =

Sophie =

3)

a) 5

b) ½

c) 5/4

**Algebra Introduction: Quiz 3 - Answers**1)

a) cost (in £) = 75 + 10

*m*b) £225

c) 12

2)

Me =

*s*David =

*s*+ 16Sophie =

*s*– 43)

a) 5

*m*b) ½

*m*or 0.5*m*c) 5/4

*m*or 1.25*m***Working**

**Questions**

1) I am a painter. I charge a flat rate of £75 (it will cost you £75 just for coming out to your property) and £10 for every square metre that I paint.

a) Write an expression for the cost (let

*m*be the number of square metres that I paint)

b) How much would I charge if I painted a room that was 15 square metres?

c) I charge someone £195 for painting their room. How many square metres did I paint?

2) I have

*s*number of sweets. My brother, David, has 16 sweets more than me. My sister, Sophie, has 20 sweets fewer than David. Write an expression for the number of sweets that David and Sophie have.

3) One episode of a TV show is

*m*minutes (assume that all of the episode in a series are the same length). Write an expression for the following scenarios:

a) I watch 5 episodes

b) I watch half an episode

c) I watch a quarter of an episode 5 times