Axis of symmetry is the x value of the vertex
the x value of the vertex, in form
y=ax^2+bx+c is -b/(2a)
so
y=-5x^2-10x-15
a=-5
b=-10
x value of vertex is -(-10)/(2*-5)=10/-10=-1
x=-1 is axis of symmetry
Answer:
180
Step-by-step explanation:
129.5 --> 130
34.62 --> 30
19.1 --> 20
130+30+20 = 180
Answer:
C. 
Step-by-step explanation:
Given wallpaper costs
per square foot.
Also, the dimension of the room is
long by
wide.
First, we will find the area of the room.
The room is in a rectangular shape.
So, the area of rectangle would be

Now, we will multiply this area with the cost of wallpaper.
As the cost of wallpaper is $1.25 per square foot.
The total cost of wallpaper for
would be 
Answer:
C. 4
Step-by-step explanation:
All other answer choices involve the variable 'b' and/or are tied to it in some way. The sole number 4 has no connection to the variable b, therefore it is C. 4.