Answer:
D.17
Step-by-step explanation:
We are given that inequality
x<15
We have to find the number which is not a solution of the given inequality.
x<15
It means the values of x which is less than 15.
A.-6
-6<15
Therefore, it is the solution of given inequality.
B.-2
-2<15
Therefore, it is the solution of given inequality.
C.11
11<15
Therefore, it is the solution of given inequality.
D.17
17>15
Therefore, it is not a solution of given inequality.
Option D is true.
Answer: 
Step-by-step explanation:
Given
Propane produced heat energy of 
The volume of the tank is 
The energy produced by this propane tank is

<span>first, we are going to define variables as the following:
a = 0
a = π/2
n = 4 rectangles
Δx = [ b - a ] / n ------>Δx = [ π/2 - 0 ] / 4 = π/8
right endpoints :
sum( seq( 4 cos(x) * π/8 , x , 0+π/8 , π/2 , π/8 ) ) = 3.163065 underestimate
left endpoints:
sum( seq( 4 cos(x) * π/8 , x , 0 , π/2-(π/8) , π/8 ) ) = 4.733861 overestimate
the reason because the actual estimate by integral as the following:
π/2
∫ 4cos(x) dx = 4
0</span>