Answer:
x = 4
Step-by-step explanation:
2 + 3(3x - 6) = 5(x - 3) + 15
Expand the parenthesis:
2 + 9x - 18 = 5x - 15 + 15
Simplify:
9x - 16 = 5x
Subtract 5x from both sides:
4x - 16 = 0
Add 16 to both sides:
4x = 16
Divide both sides by 4:
x = 4
The yearly average (mean) change was -1,115,000 visitors. (-11,150,000/10 = -1,115,000)
...
b. I assume that more people left than that of who came... so there was a lost of visitors
Answer:
First brand of antifreeze: 21 gallons
Second brand of antifreeze: 9 gallons
Step-by-step explanation:
Let's call A the amount of first brand of antifreeze. 20% pure antifreeze
Let's call B the amount of second brand of antifreeze. 70% pure antifreeze
The resulting mixture should have 35% pure antifreeze, and 30 gallons.
Then we know that the total amount of mixture will be:
Then the total amount of pure antifreeze in the mixture will be:
Then we have two equations and two unknowns so we solve the system of equations. Multiply the first equation by -0.7 and add it to the second equation:
+
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We substitute the value of A into one of the two equations and solve for B.
Answer: infinite solutions
<u>Step-by-step explanation:</u>
If the left side equals the right side, then every value you input for the variable will make a TRUE statement --> which means there are infinite solutions.
For example: x + 1 = x + 1
Any value you choose for "x" will result in a true statement.
This is because they are the same line, which is another way of showing that they have infinite solutions.