Answer:
B
Step-by-step explanation:
A. these simply to 21 + 7x and 21 + 3x
- this one is incorrect because the 7x and 3x are different
B. these simplify to 10 + x and 10 + x
- this is the correct one since they are exactly the same
C. these simplify to 21x and 7x + 21
- these two are not the same because one expression has only a number with a variable but the other one has a number with a variable <em>and </em>another number
D. these simplify to 
and 
- in subtraction, the order of the 3 and the x matters, so the equations are not the same
- example: 6 - 4 = 2 but 4 - 6 = -2
L=1.5w
P=l+w
40=2.5 w
W=16
L=1.5(16) =24
Length is 24
Width is 16
Answer:
11
Step-by-step explanation:
Solution for this problem is in this picture.
Reflection involves mirroring a point over a line.
<em>When L is reflected across the x and y axes, the new coordinates are (7,3)</em>
Given that:
When a point is reflected across the x-axis, the rule is:
So, we have:
When a point is reflected across the y-axis, the rule is:
So, we have:
Hence, the new coordinates of L are (7,3)
Read more about reflections at:
brainly.com/question/17983440
Answer:
5 gallons would be left in the tank after 4 hours.
Step-by-step explanation:
(how much is t hours)
