Triangular number sequnce
Rachel would take 30 minutes to run in 4miles
Answer:
The first question would likely be y=10.
The second question would likely be x=20.
X^2 + 3x - 6
This is because x^2 and 3x have nothing they can combine with, leaving them as their own number. 1 + - 6 will give you -5 as adding to a negative only reduces not adds entirely.
Hope this helps!