exam Maths Puzzle Numerical Ability

Which one of these is not an expression:
ab=6
a+b+c
x+2y
4(y+1)

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exam Other Question

1) Use the arithmetic sequence of numbers 2, 4, 6, 8, 10� to find the following:
a) What is d, the difference between any 2 terms?
Answer:
Show work in this space. please help me solve this problem: what is the slope of the line 3x+2y=6 ?