exam Maths Puzzle Numerical Ability

HOW DO U NO WHEN TO ADD OR SUBTRACT IN A PROMBLEM!!!!!!!



(1a3 +4a2 -7)+ (3a3 -2a2 +1)



how do u no to add or subtract the +4a2 -2a2 i no u 2a2 but how do u no what to do?

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exam Other Question

The length of the shadow of a flagpole was found to be 72 feet. The shadow of a 3 foot pole picket fence in line with the flagpole was 4 feet. What is the height of the flagpole? Write as a single logarithm and simplify.
2/3logbase8 (64)-1/2logbase8 (16)+3logbase8 (4)