Answer:
(2, 1).
Step-by-step explanation:
f(x)=2x^2-8x+9
Find -b/2a first, it's -(-8)/2(2)=8/4=2.
Then find the y-coordinate of the vertex.
2(2)^2-8(2)+9=2(4)-16+9=8-16+9=-8+9=1
Y= 11-2x
Substitute in:
5x-2(11-2x)=-13
5x-22+4x=-13(combine like-terms)
9x-22=-13
9x=-13+22
9x=9
x=1
3/7. if you make them equivalent fractions it would be 30/70 or 14/70. 30/70 is bigger.
I hope this helps you
Claudia x
father 7x
20 years later
x+20= 1/2 (7x+20)
2 (x+20)=7x+20
2x+40=7x+20
5x=20
x= 8
father 7.8=56
Answer: 
Step-by-step explanation:
Let be "x" the price in dollars of one copy of the city newspaper.
You need to analize the information provided in the exercise:
1. The total number of copies of the city newspaper sold in the newspaper stand is:

2. The amount of money earned by selling 1,000 copies of the city newspaper is:

Then, you can determine that the value of "x" can be found with:

3. Finally, substituting values, you get:
