Question

help

Answer 1

@sooobored

Answer 2

1. is still 5/4 right

Answer 3

is there any additional information above question 1, that gives the height of the building?

Answer 4

you haveto come up with a height of a building

Answer 5

oh, then what height did you decide on?

Answer 6

25

Answer 7

ft

Answer 8

ok, from this point on h0 =25ft for the rest of the problem

then 1. yes 5/4 would be correct

Answer 9

yay

Answer 10

wont help you graph,
2. -16t^2
since its negative it opens downwards
16t^2 would open upwards
we already went over this

Answer 11

you should remember this type of parabola behavior as its very useful in future problems

Answer 12

ok 3.
\[h=-16t^2 +v_0 t + h_0\]

vo is given as 150 upwards so
vo=150

we defined h0 = 25 from your first problem

so plug those in and you're get your equation

Answer 13

-16t^2+150t+25?

Answer 14

dont forget to put h= infront of it
but yes

Answer 15

3b.
you set h=0 since h=0 is the height of the ground

then solve for t
\[0=-16t^2+150 t +25\]

Answer 16

-16t^2 =-25?
150t=187.5

Answer 17

uhhhh i have no idea what you just did but it doesnt look right

you need to factor the binomial

Answer 18

or use the quadratic formula to determine t

Answer 19

9.54

Answer 20

sorry, i honestly dont know since its not something i can do in my head

Answer 21

oh well i did it in a quadratic calcultor thats what it gave me

Answer 22

should be about 9.5388

Answer 23

so yes

Answer 24

now i have to make a table and thats what it gave me but we usually cut off after 2 numbers

Answer 25

you can make the table easily yourself, just pick t values and get the solution by "plugging in"

skipping to 3f

Answer 26

why cant you have negative t and h(t) values?

Answer 27

It wouldnt make sense because the point of fireworks is to go up and negative height wouldnt make any sense at all. Its how tall something is

Answer 28

on the right track, h=1 means 1 ft off the ground h=-1 ,means 1 ft under the ground
doesnt make a lot of sense

now what does a negative t mean?

Answer 29

-t means less time you cant subtract time

Answer 30

sorta of, it means going back in time from an event

Answer 31

and time travel is not possible yet

Answer 32

lol

Answer 33

ok quick overview of 4.

its asking you to change vo
so instead of using 150 like in problem 3, you can choose something like 80

Answer 34

so any number

Answer 35

ok 81 it is

Answer 36

sorry, trying to think of a nice number that would work

Answer 37

399 is a very nice number

Answer 38

so i have to pick a firework?

Answer 39

4. is choosing another initial velocity, which was vo=150 ft/s in problem 3

Answer 40

ok so 79 then so how would i set this up the same way in question 3

Answer 41

no no use 399, its easier

Answer 42

ok how would i set this up to solve?

Answer 43

h=-16t^2 +399 t +25

look familiar?

Answer 44

ok and yes

Answer 45

oh, actually 399 doesnt help as much since you dont need to calculate when it lands on the ground

Answer 46

anyways, 4b is asking when t=3, what is the height?

so plug in 3

Answer 47

are you familiar with how to find the symmetry point?

Answer 48

kind of

Answer 49

ok quick run through then

Answer 50

you're familiar with the quadratic formula
\[\frac{-b \pm \sqrt{b^2-4ac}}{2a}\]

Answer 51

yes

Answer 52

we can divide that into 2 parts
\[\frac{-b}{2a} \pm \frac{\sqrt{b^2-4ac}}{2a}\]

Answer 53

144+1197+25 i think im off on the height for 4b

Answer 54

now parabola are always symmetrical

so the center line "x" is always \[\frac{-b}{2a}\]

Answer 55

and the other component of the quadratic equation, is the distance the roots are away from the symmetry point

Answer 56

-144

Answer 57

all other numbers are correct, so just add them all together

Answer 58

1222 for b

Answer 59

no, 1197+25-144

Answer 60

oh crap

Answer 61

1078

Answer 62

right

well hopefully you can do the rest on your own since i gotta run

Answer 63

ok thank you for the help

Answer 64

though ive covered everything you need to finish the rest