Question

1. The height h, in centimeters of water going down in a hot tub is given by the equation h(t)= -15t+120 where t is the time in minutes since the plug was pulled. What is the domain and range? Enter your answers in interval notation. [a,b]

Answer 1

I do have another math question but it's a screenshot so I can't upload it :( Makes no sense that this site don't have an "upload file" thing.... Because I also need help on a couple of questions in image form.... But it's okay no worries. :)

Answer 2

Since we don't care of the height before the plug was pulled,
t ≥ 0 <------ your domain

for the range, the initial height, namely h(0), was 120
and since we have a negative value in -15t, the range is
0 ≤ h(t) ≤ 120 <------ range

you change it to interval notation, I am used to "old school" notation.