Joe has 45 minutes before he has to go to soccer practice he spends 20 minuets eating a snack and the rest of the time doing his homework write an equation to express how long joe spent doing his homework

45=20+(x)

Step-by-step explanation:

The amount of time can be expressed as A = 45 - 20

Step-by-step explanation:

This is because we are simply subtracting the amount of minutes it takes him to eat snack from what he has left.

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

nada

step-by-step explanation: