X = 7
8(7) = 5(7) + 21
56 = 35 + 21
56 = 56
Answer:
1 is linear, 2 is linear, 3 is not linear, 4 is not linear
It will take Katie 29 weeks to reach her goal and it will take Rebecca 28 weeks to reach her goal so Rebecca will finish one week before Katie.
Hope this helps!
Answer = 2x^2+6x+1
3x+2+2x^2+3x-1
3x+1+2x^2+3x
Now combine like terms
3x+1+2x^2+3x
6x+1+2x^2
Rearrange terms
6x+1+2x^2
2x^2+6x+1
