Answer:
27 in²
Step-by-step explanation:
The area (A) is calculated as
A = πr² ( r is the radius ) , then
A = π × 3² = 3 × 9 = 27 in²
Answer:
5. A.
6. F
Step-by-step explanation:
5. Perpendicular lines have slopes that are negative reciprocals of one another, so slope is 3
y = 3x + b
using coordinates (-6,3)
3 = 3(-6) + b
b = 21
y = 3x + 21
6. I think F is the right answer
The answer is 72$
it is really closest to 72 it is 70.12222220
For this case, the first thing we must do is define variables:
p: plane speed
w: wind speed
With the wind in favor, the speed is:
![p + w = 1920/2 ](https://tex.z-dn.net/?f=p%20%2B%20w%20%3D%201920%2F2%0A)
With the wind against the speed is:
![p - w = 1920 / 3.2 ](https://tex.z-dn.net/?f=p%20-%20w%20%3D%201920%20%2F%203.2%0A)
Rewriting both equations, we have the following system of equations:
![p + w = 960 p - w = 600](https://tex.z-dn.net/?f=p%20%2B%20w%20%3D%20960%0A%0Ap%20-%20w%20%3D%20600)
Then, solving the system of equations (graphically for example), we have the solution is:
![p = 780 w = 180](https://tex.z-dn.net/?f=p%20%3D%20780%0A%0Aw%20%3D%20180)
Therefore, jet stream's speed:
Answer:
A) p + w = 960; p - w = 600; jet stream's speed = 180 km / h