We have that

we know that
Is the equation of a vertical parabola open down
so
the vertex is a maximum
step 1
convert the equation of the parabola in the vertex form

the vertex (h,k) is the point (0,36)
Part a) The point on the graph where the height of the tunnel is a maximum is (0,36)
Part b) The points on the graph where the height of the tunnel is zero feet is when y=0
so
for y=0

the points are (-6,0) and (6,0)
see the attached figure
Answer:
6 × 5 × 5 square inches
Step-by-step explanation:
The area of one of the figure's 6 squares is the product of its side length, so is ...
5 × 5 square inches
The area of all 6 of those squares is 6 times this, or ...
6 × 5 × 5 square inches
800-450=350, 350+100=450, 450-210=-240. The submarine is now positioned at 240 ft below sea level..
Answer:
c
Step-by-step explanation:
when its exponents it will add
Answer: 2048 ft
Step-by-step explanation:
Given
The length of each sidewalk is 
There are eight sections of the sidewalk
The total length of the sidewalk is 

Total length of the entire sidewalk is 2048 ft