Because they are negative
You can determine this by finding zeros of quadratic function,
.
Which eliminates first and third option.
Now we have up and down parabolas left.
If we factor
we find that the coefficient before
determines how it is turned, since its positive its an upward turned parabola hence the answer is the last graph.
Hope this helps.
The answer would be -19.8
Answer:
14.29 minutes
Step-by-step explanation:
take the sum of their time 1/20+1/50,then find the reciprocal