Can someone confirm whether or not I came up with right answers for these?

1. f(y) = 5y - 3 ; f(2.4)

My answer: f(y) = 9

2. g(m) = 2m^2 - 18 / m^2 ; g(0)

My answer: undefined

3. h(q) =

q^2 + 20, q </= - 6

4q^2 + 20, q > -6

; h(-6)

My answer: h(q) = 56

4. g(s) =

s, s </= -1

s^2 + s, -1 < s </= 1

s^3 + s^2, s > 1

; g(-4/5)

My answer: g(s) = -4/25Last one is obviously wrong, but I'm trying to figure out just

whatI did wrong. Any help would be appreciated.