Hello,
With
y=x²-4x-21
y=-5x-22
==>x²-4x-21=-5x-22
==>x²+x+1=0
In R, no solution for Δ=1-4=-3<0
Answer: 
Step-by-step explanation:

Answer:
t one because changing for t is approximately 1
and for kilometers is better you choose 1000
Answer:
2
Step-by-step explanation:
Step-by-step explanation:
(1/12) / (3/4)
= (1/12) * (4/3)
= 1/9.