GIVING BRAINLEST!

Rafi is upgrading his cell phone and monthly service plan. Triax Cell offers a new phone for $50 and unlimited service for a monthly fee of $40. CellUR offers a new phone and unlimited service for a monthly fee of $50 after how many months will the cost of 2 phones and monthly service fees be the same

the 5th month

Step-by-step explanation:

Triax=

1st month $50 phone+ $40fee = $90 first month

2nd month= $90+$40=$130

3rd month= $170 (I think you caught on tp the add $40 each month)

4th month= $210

5th month=$250

CellUR=

1st month = $50

2nd month = $50+$50=$100

3rd month = $150(I think you caught on tp the add $50 each month)

4th month= $200

5th month=$250

i think its doubled. let me know

step-by-step explanation:

mrbilldoesmath!

answer: a parabola

steps:

(x-1)(x+4)   = x(x+4) - 1(x+4) = (x^2 + 4x) - (x+4)

                = x^2 +4x -x -4   = x^2 +3x -4

which is a parabola

mrb