exam Maths Puzzle Numerical Ability

At a lumber company, shelves are sold in 4 wood types, 3 different lengths and 3 differents widths. How many different types of shelves could be ordered?

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exam Other Question

how to do these equations

(-4+3i)+(6-10i)

(1-4i)-(-3+5i)

(-2+3i)*(4-8i)

(-1+2i)/(-3+4i)
Is this equation x over 3 equals 5 a linear equation?