exam Maths Puzzle Numerical Ability

Multiply:
(8√[6] + 3√[2])(4√[6] - 5√[2])

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exam Other Question

I need to know if my answers are correct for the following problems.

During the last hour, a telemarketer dialed 20 numbers and reached 4 busy signals, 3 answering machines, this from my calculus and applied applications book
FIND THE LIMIT IF IT EXISTS
LIM x^2-64/x+8
x--> -8