Answer:
4 hours and 10 min
Step-by-step explanation:
For this equation we will do ratios:

250 min = 
4 hours and 10 min
4(60) = 240
240 + 10 = 250 minutes
 
        
             
        
        
        
Answer:
11. (x, y) -> (7, -3)
14. (x, y) -> (-3, -2)
15. (x, y) -> (-3, 2)
16. (x, y) -> (7,6)
20.(x, y) -> (4, 1)
Step-by-step explanation:
11. 
x + 3y = 1
-3x -3y = -15
-2x = -14
/-2    /-2
x = 7
x + 3y = 1
7 + 3y = 1
-7        -7
3y = -6
/3    /3
y = -2
(x, y) -> (7, -3)
14.
-3x + 3y = 3
-5x + y = 13
-5x + y = 13
+5x     +5x
y = 5x + 13
-3x + 3(5x + 13) = 3
-3x + 15x + 39 = 3
12x + 39 = 3
     - 39   -39
12x = -36
/12    /12
x = -3
Now, we solve for y:
-5x + y = 13
-5(-3) + y = 13
15 + y = 13
-15      -15
y = -2
(x, y) -> (-3, -2)
15.
6x + 6y = -6
5x + y = -13
5x + y = -13
-5x         -5x
y = -5x - 13
6x + 6y = -6
6x + 6(-5x - 13) = -6
6x -30x - 78 = -6
-24x - 78 = -6
        + 78  + 78
-24x = 72
/-24     /-24
x = -3
Now, we solve for y:
6x + 6y = -6
6x + 6y = -6
6(-3) + 6y = -6
-18 + 6y = -6
+18       +18
6y = 12
/6   /6
y = 2
(x, y) -> (-3, 2)
16.
2x + y = 20
6x - 5y = 12
2x + y = 20
-2x     -2x
y = -2x + 20
6x - 5y = 12
6x - 5(-2x + 20) = 12
6x + 10x - 100 = 12
16x - 100 = 12
     + 100  +100
16x = 112
/16    /16
x = 7
Now, we solve for y:
2x + y = 20
2(7) + y = 20
14 + y = 20
-14      -14
y = 6
(x, y) -> (7,6)
20.
-2x - y = -9
5x - 2y = 18
-2x - y = -9
+2x     +2x
-y = 2x - 9
/-1    /-1
y = -2x + 9
5x -2y = 18
5x - 2(-2x + 9) = 18
5x + 4x - 18 = 18
9x - 18 = 18
    + 18   + 18
9x = 36
/9  /9
x = 4
Now, we solve for y:
-2(4) - y = -9
-8 - y = -9
+ 8     +8
-y = -1
/-1  /-1
y = 1
(x, y) -> (4, 1)
Hope this helps!
 
        
             
        
        
        
24
The least common multiple 
of 3 and 8 is 24.
        
                    
             
        
        
        
Answer:
I am so lost but if it's how many honk out of how many you saw I would assume 7/7
 
        
             
        
        
        
Answer:
88%
Step-by-step explanation:
(73+75+84+x)/4=80
x4 to both sides
73+75+84+x=80x4
73+75+84+x=320
232+x=320
x=320-232
x=88