Rocket fuel consumption too easy?

[shutoutsteve]

Homework Statement

Rocket with fuel mass of m(initial)
Rocket without fuel is m(final)
Time for fuel to be used up is t(final)

Homework Equations

What is m(t) (slope of m vs t graph)
(i assume t(initial) is zero

The Attempt at a Solution

[((m(final) -m(initial)) / t(final)]t + m(initial) for interval 0<t<tf

just mx+b?

 

[asleight]

Homework Statement

Rocket with fuel mass of m(initial)
Rocket without fuel is m(final)
Time for fuel to be used up is t(final)

Homework Equations

What is m(t) (slope of m vs t graph)
(i assume t(initial) is zero

The Attempt at a Solution

[((m(final) -m(initial)) / t(final)]t + m(initial) for interval 0<t<tf

just mx+b?

That's true if mass is lost at a constant rate.

 

[shutoutsteve]

Yes, that was given too.
Our other assignment page is covered in derivatives and integrals, but my answer for this one was simple math, so I was worried I had it wrong. :)