Suppose a toy rocket is launched vertically upward from ground level with an initial velocity of 128 feet per second. if air resistance is ignored, the rocket's h height after t seconds is given by the equation h = −16t2 +128t. how long will the rocket's flight last?
a) 6 seconds
b) 7 seconds
c) 8 seconds
d) 9 seconds

answer:

b

step-by-step explanation:

i think the answer is seven, for if i'm being useless °ω°

step-by-step explanation:

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl