who can help me thanks Maths problems?

Dec 21st, 2014
Price: $5 USD

Question description

If L = MN, what is the percentage increase in L if M increases by 15% and N increases by 20% ??

hello, im studying out of collegeboard's SAT test prep book, and i came across a math problem that I don't understand how to solve... it only provides the answer 

If 18√18 = r√t , where r and t are positive integers and r > t, which of the following could be the value of rt? 
a) 18 
b) 36 
c) 108 
d) 162 
e) 324 

The answer is C but I dont get how... because it all makes sense to do 18 x √18(which is around 4.24) = 76.32 because 18 > √18..?? or 36 x √36 (6) = 216 ? 

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(Top Tutor) Mario S
School: UC Berkeley

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