exam Maths Puzzle Numerical Ability

What is the following in regular notation:

8.1 x 10^4

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exam Other Question

if the sides of a triangle are 13, 14 and 15 cm long, then the altitude drawn to the 24 cm side is 12 cm long. how long are the other two altitudes?> which side has the longest altitude? I dont really understand the distributive property, can you explain it to me