Hrjohnson2004
27.05.2020 •
Mathematics
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3.) A rocket carrying fireworks is launched from a hill 80 feet above a lake. The
rocket will fall into the lake after exploding at its maximum height. The
rocket's height above the surface of the lake is represented by
h=- 16t2 +64t + 80. How many seconds after the rocket launched will it
hit the lake?
Part A: Define your terms:
a=
b =
C=
Part B: Set up the quadratic formula:
І
-OEVO2 – 4 (0)
20.
D) Focus
00
Solved
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Ответ:
(–1, 1) and (–6, –1)
(1, 0) and (6, 2)
(3, 0) and (8, 2)
Step-by-step explanation:
Slope of line having points (x1, y1) and (x2,y2) is given by (y2-y1)/(x2-x1)
Two lines with slope m1 and m2 are parallel if there slopes are equal i.e m1 = m2.
Slope of line that contains (3, 4) and (–2, 2)
m = (2-4)/(-2-3) = -2/-5 = 2/5
To find if other pair of lines lie on line parallel to line that contains (3, 4) and (–2, 2), we need to find slope for other pair of points , if those pairs have slopes as 2/5 then its clear that they lie on line parallel to line that contains (3, 4) and (–2, 2) else not.
Lets find slope of all the pairs
(–2, –5) and (–7, –3)
m1 = -3 -(-5)/-7-(-2) = -3+5/-7+2
m1 = 2/-5 = -2/5
as -2/5 is not equal to 2/5, the mentioned points do not lie on line parallel to line that contains (3, 4) and (–2, 2).
(–1, 1) and (–6, –1)
m2 = -1 -1)/-6-(-1) = -2/-6+1
m2 = -2/-5 = 2/5
as 2/5 is equal to 2/5, the mentioned points do lie on line parallel to line that contains (3, 4) and (–2, 2).
(0, 0) and (2, 5)
m3 = 5 -0)/2-0
m3 = 5/2
as 5/2 is not equal to 2/5, the mentioned points do not lie on line parallel to line that contains (3, 4) and (–2, 2).
(1, 0) and (6, 2)
m4 = 2 -0)/6-1
m4 = 2/5
as m4
As m4 is equal to 2/5, the mentioned points do lie on line parallel to line that contains (3, 4) and (–2, 2).
(3, 0) and (8, 2)
m5 = 2 -0)/8-3
m5 = 2/5
as m5 is equal to 2/5, the mentioned points do lie on line parallel to line that contains (3, 4) and (–2, 2).
Thus, pair of points which lie on lie on line parallel to line that contains (3, 4) and (–2, 2) are
(–1, 1) and (–6, –1)
(1, 0) and (6, 2)
(3, 0) and (8, 2)