The answers comes to be for every 1 unit of pure acid (100%) add three units of 20% and you get the desired 40%
so if you need 40 L (i don't know what container sizes there are so i can't give you an exact amount just add 1 part 100% acid and 3 parts 20% acid) <span />
For #6;
We know that there are 46% male students and 30% of them are seniors. This means that we have to assume that 30% of the male students are seniors and that 30% of the female students are seniors. Taking 30% of 46% gives us 13.8%.
For #7;
We are looking for the possibility that we choose a junior student (22%) or a sophomore student (28%). This adds up to 50% (22%+28% = 50%). That is out answer.
Root: -3/2, -3/4
..............
4x+y>-6
y>-4x-6
Then:
(-1,-1)
if x=-1; and y=-1
-1>-4(-1)-6
-1>4-6
-1>-2;
(-1,-1) is a solution for this in-equation.
(0,-9)
0>-4(-9)-6
0>36-6
0>30 this is not true, therefore (0,-9) is not a solution.
(4,-20)
-20>-4(4)-6
-20>-16-6
-20>-22 This is true, therefore (4,-20) is a solution.
(2,0)
0>-4(2)-6
0>-8-6
0>-14 This is true, therefore (2,0) is a solution.
(-3,6)
6>-4(-3)-6
6>12-6
6>6 This is not true, therefore (-3,6) is not a solution for this in-equality.
Answer: The next pairs are solutions to this inequality: (-1,-1) , (4,20), (2,0).
Answer:
174°, 174°, 6°
Step-by-step explanation:
opposite angles in a parallelogram are congruent, so one of the other angles = 6°
parallelogram = 360°
the other angles in the parallelogram = x
x + x + 6° + 6° = 360°
2x = 348
x = 174°
Check Your Work:
174° + 174° + 6° + 6° = 360°
Let me know if you have any more doubts! :D
