Answer:
I'm assuming you want to know the amount of child and adult tickets sold. 450 student tickets were sol, and 300 adult tickets.
Step-by-step explanation:
Solve for the first variable in one of the equations, then substitute the result into the other equation.
Answer: 
<u>Step-by-step explanation:</u>
To find the tangent, you need to find the derivative with respect to x.
Then substitute x = 1 into the derivative.
Given: 0 = 2x² - xy - y²
Derivative: 0 = 4x - y' - 2yy'
Solve for y': 2yy' + y' = 4x
y'(2y + 1) = 4x


Answer:

Step-by-step explanation:
We need to find the value of x so that the value of given function becomes 21 .
We have ,

Now , for finding x ,
Answer:
16
Step-by-step explanation:
4x3=12 tins of white paint
12+4=16 total tins
Answer:
I believe its a vertical angle
Step-by-step explanation: