Ratio 1:2 from boys to girls
The inequality that represents the number of right answers (r) and wrong answers (w) Olga can give to win the contest is: 
<u><em>Explanation</em></u>
Number of right answers is
and number of wrong answers is 
Olga earns 12 points for each right answer and loses 4 points for each wrong answer.
So, total points earned for
right answers
and total points lost for
wrong answers 
That means, <u>her score will be</u>:
points.
In order to win the quiz contest, Olga must score <u>more than 400 points</u>. So, the inequality will be.......

Answer:
See the attachment for the points and line of interest.
Step-by-step explanation:
A graphing calculator or graphing utility can show you the curve.
For ax²+bx+c, the line of symmetry is x=-b/(2a). That is also the x-coordinate of the vertex. The y-intercept is the constant, the value of the function when x=0. The x-intercepts are the values of x that make f(x) = 0.
Here, those are x=4 and x=-2. You can factor f(x) as (x+2)(x-4). These values of x make the factors, and the function, zero.
D. 9x-2
This is equivalent to the expression.
hope this helps!
Answer:
B. 7 and 60
C. 11 and 56
Step-by-step explanation:
see the attached figure to better understand the problem
we know that
The area of the three squares must satisfy the Pythagorean Theorem
so

where
c^2 is the area of the largest square
a^2 and b^2 are the areas of the smaller squares

The sum of the areas of the smaller squares must be equal to 67
therefore
7 and 60 ----> could be the areas of the smaller squares (60+7=67)
11 and 56 ----> could be the areas of the smaller squares (11+56=67)