Answer:
Identity element property
Step-by-step explanation:
The property that justifies the step 3 is the identity element property.
Mathematically, the identity element is that number such that performing an arithmetic operation such as addition or multiplication with the number gives back the number we started with
For addition, the identity element is 0
while for multiplication, the identity element is 1
Answer:
x=12
Step-by-step explanation:
2x-4=20
2x=24
x=12
X is 6.11431
so 6.1 rounded to nearest tenth
Answer:
40 girls
Step-by-step explanation:
Set up a proportion where x is the number of girls in band class:
= 
Cross multiply and solve for x:
3x = 120
x = 40
So, there were 40 girls in band class.
The point (a,b) would be in quadrant 2 (the one on the top left)
