Answer:
9 shirts
Step-by-step explanation:
20% of the shirts were blue
20% of 30 is 6
6 shirts were blue
1/2 of the shirts were black
1/2 = 50%
50% of 30 is 15
15 shirts are black
15 + 6 = 21
30 - 21 = 9
(or you could add the percentages to get 70%, and get 30%. 30% of 30 is 9.)
Hope this helps!
Given:
The graph of two lines.
To find:
The slope of each line and check whether they are same or different.
Solution:
If a line passes through two points, then the slope of a line is:

From the graph 1, it is clear that the line passes through the points (2,175) and (3,165). So, the slope of first line is:



The slope of first line is 10.
From the graph 2, it is clear that the line passes through the points (1,175) and (2,165). So, the slope of first line is:



The slope of second line is 10.

Therefore, the slopes of both lines are same, i.e. 10.
Answer:
x = 56.31%
Step-by-step explanation:
to find x, use 
x = 
x = 
x = 1.5
x = 56.3099
56.3099 = 56.31
Im not sure if its y=19
y= 6(5)-11
y=30-11
y=19