Answer:
1) 
.
2) 
3) 
4) 
5) 
6) 
7) 
8) 
Step-by-step explanation:
In the given number lines, rightarrows represent positive integers and leftarrows represent negative integers.
1)
In first number line we have two rightarrows.
Rightarrow from 0-4 = 4
Rightarrow from 4-9 = 5
So, required sum is .
Similarly,
2)
3)
4)
5)
6)
7)
8)
<span>it depends on what type of format is used.</span>
Given:
<span>mantle layer of earth begins about 70 kilometers underneath the surface
</span><span>outer core begins about 2970 kilometers underneath the surface
Since we need to find the position of each layer </span><span>relative to the surface, the surface will serve as the point of origin or 0. Below the surface infers a negative value. So, Mantle layer is -70 km from the surface while outer core is -2970 km under the surface.
Comparing -70 and -2970, -70 has a greater value than -2970. The nearer the number is to the origin or 0, the higher its value.
Comparing the absolute greater value of -70 and -2970, -2970 has a greater absolute value. This is because absolute value is the positive value of the number. Absolute value of -70 is 70 while absolute value of -2970 is 2970. Thus, -2970 has a greater absolute value. </span>
I’m not sure if you need the steps but x is -4 and y is -1
(5y+6y)+(4x+8y)+(1z-5y)=
5y+6y+4x+8y+1z-5y=
14y+4x+1z
Melissa combined unlike terms
