Trevor is tiling his bathroom floor, which has an area that is represented as 120r3 square inches. Each tile has an area of the square root of the quantity 16 times r to the ninth power.. Use the given information to write and simplify an expression for the total number of tiles used.

Question

just_gymnast_me · Answer

not really sure how to do this..please help! ;/

bohotness · Answer

https://answers.yahoo.com/question/index;_ylt=AwrTcdnz_UBVdKkAknUnnIlQ;_ylu=X3oDMTEzanAxNmJyBGNvbG8DZ3ExBHBvcwMxBHZ0aWQDRkZVSUMwXzEEc2VjA3Ny?qid=20120826181823AA66oO0

just_gymnast_me · Answer

thank you! can you explain how to get the answer a little bit?

just_gymnast_me · Answer

@bohotness

just_gymnast_me · Answer

im still confused..

anonymous · Answer

ANSWER: TILES USED = 30 / [r * sqrt(r)] 

Why??? 
TILES USED = TOTAL AREA / AREA per TILE 

= 120r^3 / sqrt(16r^9) = 120r^3 / [sqrt(16) * sqrt(r^9)] 
=120r^3 / [4 * sqrt(r^8) *sqrt(r)] = 120r^3 / [ 4 * r^4 * sqrt(4)] 
=30 / [r * sqrt(r)]