exam Maths Puzzle Numerical Ability

the gate of a fence is 8ft. tall and 15ft. wide. how long is the diagonal strip (d) used to brace the gate

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exam Other Question

if (1+x+x^2)= a0+a1x+a2x^2+a3x^3+........+a2nx^2n then show that

a0+a3+a6+......= 3^(n-1)
To Whomever can assist, thank you!

If a box of candy costs a retailer $2.50, and he wants to make a profit of 50% based on the selling price, what price should he charge for the candy?