Answer:
dependent variable
Step-by-step explanation:
from what i have seen this is the right choice heres an example of how i came up with it you can decide off of this
Independent variable causes an effect on the dependent variable. Example: How long you sleep (independent variable) affects your test score (dependent variable). ... Example: Your test score affects how long you sleep.
Assume that the amount needed from the 5% solution is x and that the amount needed from the 65% solution is y.
We are given that, the final solution should be 42 ml, this means that:
x + y = 42 ...........> equation I
This can also be written as:
x = 42-y .......> equation II
We are also given that the final concentration should be 45%, this means that:
5% x + 65% y = 45% (x+y)
0.05x + 0.65y = 0.45(x+y)
We have x+y = 42 from equation I, therefore:
0.05x + 0.65y = 0.45(42)
0.05x + 0.65y = 18.9 .........> equation III
Substitute with equation II in equation III as follows:
0.05x + 0.65y = 18.9
0.05(42-y) + 0.65y = 18.9
2.1 - 0.05y + 0.65y = 18.9
0.6y = 18.9 - 2.1
0.6y = 16.8
y = 28 ml
Substitute with y in equation II to get x as follows:
x = 42-y
x = 42 - 28
x = 14 ml
Based on the above calculations:
amount of 5% solution = x = 14 ml
amount of 65% solution = y = 28 ml
The correct choice is:
The teacher will need 14 mL of the 5% solution and 28 mL of the 65% solution.
-26 < 54
Negative numbers are smaller than positive numbers
Hello! :p
1. question: -7x = 63 Answer: x = -9
2. question: x + 8 = -15 Answer: x = -23
3. question: 2/3x = 27 Answer: exact form: x = 81/2 decimal form: x = 40.5 Mixed number form: x = 40 1/2
4. question: x/9 = 5 Answer: x = 45
5.question: x + 2.6 = 1.7 Answer: x = -0.9
6.question: -8x = -56 Answer: x = 7
Hope this helps! Have a wonderful day! :)
<span>(−2+2i)⋅(5+5i)
FOIL
-10-10i+10i+10i</span>²=-10+10i² this is the simplify answer
If you want the complete answer is
-10+10(-1)=-10-10=-20
