Answer:
x = (1/2) (-9 ± √73)
Step-by-step explanation:
Using completing the square method
x²+9x+2=0
x²+9x = -2 (complete the square by adding (9/2)² to both sides)
x²+9x + (9/2)² = -2 + (9/2)²
( x + (9/2) )² = -2+ (9/2)²
( x + (9/2) )² = -2+ (81/4)
( x + (9/2) )² = 73/4
x + (9/2) = ± √(73/4)
x + (9/2) = ± √(73) / 2
x = -(9/2) ± √(73) / 2 (factorize out (1/2) )
x = (1/2) (-9 ± √73)
The answer is 5.6! Hope I helped!
Answer:
C. I hope this helps!
Step-by-step explanation:
Answer:
1.39%
Step-by-step explanation:
(21 - 32) / 5 = -2.2 z score
= 0.0139 so there is a 1.39% probability
Answer:
380 feet below sea level.
Step-by-step explanation:
Given:
A submarine is is 250 feet below sea level.
It descended another 130 feet.
Question asked:
How many feet below sea level is the submarine now?
Solution:
A submarine is initially below the sea level = 250 feet
Another descend below the sea level = 130 feet
Now, we have to calculate the final level of submarine below the sea level and for it we will simply add initial level to the another descended depth:-
250 feet + 130 feet = 380 feet.
Therefore, submarine is now 380 feet below sea level.
