I dont know this awnser its realy hard wow
Answer:
factoring trinomial
Step-by-step explanation:
x^2 - 6x - 27 = 0
(x - 9)(x + 3)
x = ( 9 , - 3)
The amount of time required to travel a certain distance is equal to quotient of distance and speed. We let x be the speed of Terry and Mark's will be x+2. The equation that would best represent the scenario is,
15/x = 21/(x+2)
The value of x is 5. Thus, Mark's speed is 7 mph.
My explanation is attached below.