Three ice cream cones cost $8.40. At this rate, how much do two ice cream cones cost?
2 answers:
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Answer:
The secondary attack rate is 55%
Step-by-step explanation:
Total number of students = 83
Primary cases: cases A+B+C = 3 primary cases.
Secondary cases = 44
Total cases = 44 + 3 = 47
To find the secondary attack rate, we are to assume that the primary cases are now immune because they had the illness.
We have:
Secondary attack rate =
The secondary attack rate is 55%
Answer:
Maximum value:
Minimum value:
Step-by-step explanation:
Let , the restriction function.The Lagrange Multiplier problem states that an extreme (x1, ..., xn) of f with the constraint g(x) = 9 has to follow the following rule:
for a constant .
Note that the partial derivate of f respect to any variable is 1, and the partial derivate of g respect xi is 2xi, this means that
Thus,
Where c is a constant that doesnt depend on i. In other words, there exists c such that (x1, x2, ..., xn) = (c,c, ..., c). Now, since g(x1, ..., xn) = 9, we have that n * c² = 9, or
When c is positive, f reaches a maximum, which is
On the other hand, when c is negative, f reaches a minimum,
Answer:
x = -1 + , x = -1 -
Step-by-step explanation:
4 + 8x - 3 = 0
First, add 3 to both sides:
4 + 8x = 3
Next, divide both sides by 4:
+ 2x =
Now, add the correct number by dividing 2 by 2 and squaring it and add it to both sides:
+ 2x + 1 =
Then, factor the left side:
=
Next, take the square root of both sides:
x + 1 = ±
Solve for x:
x = -1 + , x = -1 -