If f(x) = [x] − 5, what is f(8.6)?
a. 3
b. 4
c. 8
d. 9

Leo has b boxes of pencils. each box contains 6 pencils. he has a total of 42 pencils. the equation that represents this situation the value of b that makes the equation true the first one is b+6=42,6b=42,b=42+6,or 42b=6 the second one are 7,836 48

Could somebody me with this radical simplification?

Find two numbers if their sum is 91 and the ratio is 6: 7?