Starting at home, Jessica traveled uphill to the grocery store for 18 minutes at just 20 mph. She then traveled back home along
the same path downhill at a speed of 60 mph. What is her average speed for the entire trip from home to the grocery store and back?
It takes 45 minutes for 4 people to paint 5 walls. How many minutes does it take 6 people to paint 4 walls?
It takes 52 minutes for 5 people to paint 5 walls. How many minutes does it take 20 people to paint 20 walls?
It takes 48 minutes for 7 people to paint 7 walls.How many minutes does it take 20 people to paint 20 walls?
It takes 45 minutes for 4 people to paint 5 walls. How many minutes does it take 6 people to paint 4 walls?
It takes 52 minutes for 5 people to paint 5 walls. How many minutes does it take 20 people to paint 20 walls?
It takes 48 minutes for 7 people to paint 7 walls.How many minutes does it take 20 people to paint 20 walls?
1 answer:
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Answer:
Step-by-step explanation:
The pattern is easy to see.
For any polynomial, first check to see if it factors. Then you can set each factor equal to zero.
The three zeros are -1,1,3
Next plug in values in each interval between zeros to test whether its greater than 0.
Try x values: -2,0,2,4
x = -2 yields a negative result, the interval x< -1 is Not a solution.
x = 0 yields a positive result, the interval -1
x = 2 yields a negative result, the interval 1
x = 4 yields a positive result, the interval x>3 IS a solution
The three zeros are -1,1,3
Next plug in values in each interval between zeros to test whether its greater than 0.
Try x values: -2,0,2,4
x = -2 yields a negative result, the interval x< -1 is Not a solution.
x = 0 yields a positive result, the interval -1
x = 2 yields a negative result, the interval 1
x = 4 yields a positive result, the interval x>3 IS a solution