N³ - 2n² - 15n = 0
"n"
n (n² + 2n - 15) = 0
n = 0
n² + 2n - 15 = 0
Δ = (2)² - 4(1)(-15)
Δ = 4 + 60 = 64
n' = (-2+8) / 2 = 6/2 =3
n'' = (-2-8) / 2 = -10/2 = -5
Solution:
S {-5 , 0 , 3 }
Answer:
7 1/3
Step-by-step explanation:
V = πr²h
V₁ = π x 4² x 11 = 176π
v₂ = π x 2² x 6 = 24π
V₁ /v₂ = 176π / 24π = 22/3 = 7 1/3
Answer:
84%
Step-by-step explanation:
Joey gives 21 correct answers out of 25 questions on a quiz.
We have to calculate the percent of Joey's correct answer.
Now, percentage of x out of y is given by the simple expression 
%.
Hence, the percentage of correct answer given by Joey is given by
%. ( Answer )
Answer:
D
Step-by-step explanation:
because 4x4=16..........
First, let's write down this inequality:
<span>There are at least 245 students enrolled in the school.
y≥245
This inequality says what the sentence says!
now, the number of teachers must be:
x≥2*(y/25)
(two times the number of groups of students of 25!)
so those two inequalities, taken together will be the answer!
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