Can someone help me with this? Its asking “ determine whether each relation is a function, state the reason why”

Acar traveling at 65 mph leaves 25 foot skid mark what is the ratio of the speed to length of skid mark (feet) in the simplest form

Asequence is defined recursively by the formula  f(n  +  1)  =  f(n)  +  3 . the first term of the sequence is  –4. what is the next term in the sequence? –7–117

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x