exam Maths Puzzle Numerical Ability

three faces of a box have a common vertex and their combined area is 20cm squared. What is the total surface area of the box?

thank you.

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exam Other Question

Find the determinate of the matrix
(8 + 4a 4)
(5 + 3a 3)

Possible answers are:
a.) 4
b.) 44
c.) 4 + 24a
d.) 44 + 24a i really need some help to solve the following problem: y=x^2-9x+3 I tried to do it but kept getting different answers when I graphed it.