Answer:
Domain: (
−
∞
,
∞
)
,
{
x
|
x
∈
R
}
Range: (
−
∞
,
∞
)
,
{
y
|
y
∈
R
}
Domain: {-1}
Range: {0, 4, 9, 15}
Function? No
Explanation:
The domain is the x value in the given points. The only x value is -1.
The range is the y value in the given points.
You can tell if this is a function if it has repeating x values or not. Since the x value of -1 repeats, it is not a function.
Hope this helps, and please mark brainliest :)
Think of it like a triangle.
The flagpole is vertical and is at 90° to the ground. This makes a right-angle to the ground, which is flat.
Since we have two sides of the triangle already, and they are in a ratio of ?? : 16 : 20 = ?? : 4 : 5, that means that because the triangle is a right-angled triangle, the third and last side must be 3 to complete the ratio! (This is called 'Pythagoras')
Since the other sides were divided by 4 to get the simple ratio, we must multiply 3 to get the actual ratio!
3 × 4 = 12 ft tall flagpole.