A substance used to dissolve other substances is a solvent. Saturation is how much solute is in a solution. Solubility is a measure of how much solute can dissolve in a given solvent. A solute is that which is dissolved.
Answer:
The first one 2/5
Step-by-step explanation:
The x is a placeholder for a number. Think of x like a box and inside the box will go a number. In this case, -4 will replace x
7 - 2x = 7 - 2(-4) = 7 + 8 = 15
<h3>Answer: 15</h3>
Solve for x over the real numbers:
x^2 - 4 x - 5 = 0
The left hand side factors into a product with two terms:
(x - 5) (x + 1) = 0
Split into two equations:
x - 5 = 0 or x + 1 = 0
Add 5 to both sides:
x = 5 or x + 1 = 0
Subtract 1 from both sides:
Answer: x = 5 or x = -1
Times two 25×2=50 thats the answer