exam Maths Puzzle Numerical Ability

if a[1]=4 and d=-2, what are the first four terms of the arithmetic sequence?

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exam Other Question

find the total volume, then the height of a cylinder filled with liquid to 1/2, 1/3, 1/5, 1/6 full.
it has a length of 30m and a base radius of 8m Find the area of the sector of a cirlce if the measure of arc AC = 61 degrees 12 minutes and line AB =3cm