Answer:
Step-by-step explanation:
from the pythagorean theorem:
<span>y=
-0.000475x^2 + 0.851x
How high above is the
river bridge (the top of the arch)?
You have to find the vertex of of the parabole: the y-coordinate is the highest point.
Remember that the x-coordinate of the vertex of a parabole is at - b / 2a.
That is x = - 0.851 / [ 2(-0.000475) = 895.79
The corresponden y is y = </span><span>-0.000475(895.79)^2 + 0.851(895.79) = 381.16 feet above the river.
How long is section of bridge above
the arch?
The section of the brige is equal to the difference of the two roots
Roots: </span><span>y=
-0.000475x^2 + 0.851x = 0
=> x( - 0.000475x + 0.851) = 0
=> x = 0 and x = 0.851 / 0.000475 = 1791.58
Then the section is 1791.58 feet long.
Therefore, the answer is the option </span><span>D)The bridge is about 381.16 ft. above the river, and the length of the bridge above the arch is about 1,791.58 ft
</span>
Answer:
b
Step-by-step explanation:
:0
Answer:
-11(j+3k)
Step-by-step explanation:
-11j-33k
We can factor out a negative 11 from each term
-11j = -11 *j
-33k = -11 *3k
-11j -33k = -11(j+3k)
Answer: 765.85
Step-by-step explanation:
70% of 425 is 297.5
297.5 + 425 = 722.5
6% of 722.5 is 43.35
thus it is $765.85
If its simplified it would either be $765 or $766 depending if you want to round the decimal to the closest ones, or if you don't need the decimal.
