exam Maths Puzzle Numerical Ability

How do I solve 5 square root 20 + 3 square root 98 - 2 square root 45 + the square root of 15.

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exam Other Question

the probablity of receving a passing grade on a biology test is 80%. what are the odds of a student in the class receiving a failing grade?
thanks!
aloha! Find the quotient 3-i/4+2i thanks alot