Answer:
a) 0.00673
b)0.9596
Step-by-step explanation:
Let be X the random variable : ''Number of deaths from this disease''
X ~ P(λt)
Where λ is number of events per unit time and λt is number of events over time period t
In our exercise t = 1 year
λ : lambda
The probability function for X is :
x ≥ 0
a)
b)
![P(X\geq 2)=1-[e^{-5}+\frac{e^{-5}.(5)^1}{1!}}]=1-[e^{-5}+5(e^{-5})]=1-6(e^{-5})=0.9596](https://tex.z-dn.net/?f=P%28X%5Cgeq%202%29%3D1-%5Be%5E%7B-5%7D%2B%5Cfrac%7Be%5E%7B-5%7D.%285%29%5E1%7D%7B1%21%7D%7D%5D%3D1-%5Be%5E%7B-5%7D%2B5%28e%5E%7B-5%7D%29%5D%3D1-6%28e%5E%7B-5%7D%29%3D0.9596)
To calculate the length of the rectangle we let the length be x in, let width be
(2x-5) inches
The area will be given by:
A=length×width
A=x(2x-5)
but
A=700 in²
thus
700=x(2x-5)
700=2x²-5x
this can be written in quadratic form as:
2x²-5x-700=0
solving the quadratic we get:
x=20 or x=-35/2
since the length cannot be negative then:
x=20 in
thus the width will be:
2*20-5
=40-5=35 inches
Answer:
option B
i.e 8u + 4
Step-by-step explanation:
3u+4+5u
= 8u + 4
Answer:
ok listen when looking at the graph the answer is easy its b
Step-by-step explanation:
Answer:
Step-by-step explanation:
Given
Required
Determine the type of roots
Represent Discriminant with D; such that
D is calculated as thus
And it has the following sequence of results
When 
then the roots of the quadratic equation are real but not equal
When 
then the roots of the quadratic equation are real and equal
When 
then the roots of the quadratic equation are complex or imaginary
Given that ; This means that and base on the above analysis, we can conclude that the roots of the quadratic equation are complex or imaginary
