exam Maths Puzzle Numerical Ability

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Mandy begins bicycling west at 20mph. Liz leaves from the same point 1 hour later bicycling west at 30mph. When will

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do you know the answer to m+13=-9 and can you show me how you got the answer 29. Write a rule for the function:x=2,3,7,10 y=8,7,3,0

30. Write a rule for the function: x=0,4,8,12 y=5,7,9,11