exam Maths Puzzle Numerical Ability

3, -5, -2.4,1
0.25, -0.5, 0.2, -2
0.01, 0.1, 0, -1/10
-2.7,1/2,0.3, -7

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exam Other Question

Use an exponent to express the area of a square whose side measures 18 cm. find an equation for the line with slope 1/2 and y-intercept of 3

This is what I did:

y=mx+b
y=1/2x+3
y-1/2 =3
2y-x=6(divided both sides by 2)
or
-x+2y=6