D should be the right answer
I would say 140 is a big outlier for sure in this problem. i would maybe also say that 56, 59, and 60 are outliers as well only because they are super far away from 1-10.
Original position of the submarine below the Surface = -2 2/3= -8/3
Submarine at a depth of -2 2/3 feet descended by 5 1/2 feet.
So new position of the Submarine =
To Reach the surface submarine must rise = 0-(-49/6)
As seen from the equation the two negative sign [(-)(-)] will change into a positive sign.
At the surface the position of the submarine = +49/6 feet
Explanation
Step 1
solve for each factor:
set each factor equal to zero
so, we have 3 critical numbers
-3,-1 and 1
Step 2
now, let's make a table to evaluate each interval , (select a number from the interval)
b) (x+1)
c)(x-1)
Step 3
now, make th multiplication of the signs ( check the table in step 2)
so, we got
(-infi, -1) U (1, inf)
as we need that the product of the factors is greater than zero ( positive) , the solution is( set notation)
I hope this helps you