exam Maths Puzzle Numerical Ability

a+7=16
12+x=21
4d=60
15=u
-
3
b
- =12
7

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exam Other Question

Here is the problem im being asked to solve:

x^4-5x^2-36=0 can you please assist me here: find the area of a right triangle with legs of length 5square root of 3 and 2sqaure root of 3+3square root of 2.