9090 is 70% of 12,985.7143
B is the answer how you do good
Answer:
383 m
Step-by-step explanation:
Answer:
Well the answer is the first one 3 (5 x) and 15x
Step-by-step explanation:
Because it is the same thing as (5 x) 3. The numbers just changed the positions.
And 15x because you can multiply the first 5 times 3 and that is equal with 15 and then you put the x at the end. 15x
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