Answer:
22.86 ml.
Step-by-step explanation:
Let x ml of 5% sulfuric solution must Molly add to 20ml of 20% solution to get a 12% solution.
Now, x ml of 5% sulfuric acid solution has pure acid of ml.
Again, 20 ml of 20% sulfuric acid solution has pure acid of ml.
Therefore, we can write the equation as
⇒ 0.05x + 4 = 2.4 + 0.12x
⇒ 0.07x = 1.6
⇒ x = 22.86 ml. (Answer) (Approximate value)
Answer:
y = 0.1x - 4
Step-by-step explanation:
Given the following data;
Points on the x-axis (x1, x2) = (-3, 7)
Points on the y-axis (y1, y2) = (-7, -6)
First of all, we would find the slope;
Mathematically, slope is given by the formula;
Substituting into the equation, we have;
Slope = (-6 - (-7))/(7 - (-3))
Slope = (-6 + 7)/(7 + 3)
Slope = 1/10
Slope = 0.1
Next, we would write the equation using the formula;
y - y1 = m(x - x1)
y - (-7) = 0.1(x - (-3))
y + 7 = 0.1(x + 3)
y + 7 = 0.1x + 3
y = 0.1x + 3 - 7
y = 0.1x - 4