Question

i give medals and fans

Answer 1

If a baseball player hits a baseball from 4 feet off the ground with an initial velocity of 64 feet per second, how long will it take the baseball to hit the ground? Use the equation\[h=-16t^{2}+64t+4\]
choices
\[2\pm \frac{ \sqrt{17} }{ 2}\]
\[\frac{ 2\pm \sqrt{17} }{ 2 }\]
\[2\pm4\sqrt{17}\]
\[\frac{ 16\pm \sqrt{17} }{ 2 }\]

Answer 2

Solve by using the quadratic method \[ x= \frac{(-b \pm \sqrt{b^2-4ac})}{2a }\]

Answer 3

\[h=-16^2t+64t=4\] Where 16=a 64=b and 4=c

Answer 4

\[\frac{ 64\sqrt{3840} }{ 32 }\]

Answer 5

For Solving this Question, I would like to ask you that, do you have the detailed conception of : Roots

Answer 6

@Hope_nicole can you help

Answer 7

im ok with perfect squares

Answer 8

use the equation that @jperez570 told you

Answer 9

i have and after simplifying everything in the radical i get
\[\frac{ 64\pm \sqrt{3840} }{ 32 }\]

Answer 10

well you can simplify first, right?

Answer 11

ya which part

Answer 12

you tell me and @jperez570 please make sure i do it right!

Answer 13

the 64

Answer 14

okay, so now that you know that, you can have 2+- sqrt3840/32

Answer 15

ok and then the denominator 32

Answer 16

yeah thats what the =32 is, so now you have sqrt3840, do you remember factor trees?

Answer 17

ya

Answer 18

okay so do that with 3840

Answer 19

mine comes out to\[2\sqrt{2*2*2*2*2*2*2*2*3*5}\]

Answer 20

im not sure how you got that..

Answer 21

i dont no either

Answer 22

the part you have underneath the sqrt is right, the 2 outside though shouldnt be there.

Answer 23

ok first use the quadratic equation in which you all ready have a, b, and c now just solve

Answer 24

when it comes down to the square root you need to know how to solve it before you advance

Answer 25

ok i cant figure it out i keep on coming up with\[\sqrt{3840}\]

Answer 26

ok what two number multiplied together give you 3840? **Hint** one number HAS to have a square root

Answer 27

64

Answer 28

ok what two numbers?

Answer 29

8

Answer 30

64*8=3840? you sure?

Answer 31

64*60=3840

Answer 32

what is the square root of 64

Answer 33

8

Answer 34

ok now you pull that out and you have \[8\sqrt{60}\] now that you have that you can still simplify or no?

Answer 35

ya

Answer 36

ok what two numbers give you 60 but with one has a square root

Answer 37

4*15

Answer 38

whats the square root of 4?

Answer 39

2

Answer 40

\[16\sqrt{15}\]

Answer 41

ok so now \[8(2)\sqrt{15}\] right?

Answer 42

correct but \[\sqrt{15}\] isnt involved in any of the choices

Answer 43

then you probably did something wrong make sure you have checked all your work you might have forgotten about a number or a negative sign

Answer 44

i have

Answer 45

best thing to do is redo the work make sure you do it slow and double check as you go on

Answer 46

ok

Answer 47

i have double check it and still the same thing i dont know whats going on

Answer 48

ask your teacher

Answer 49

its an online class

Answer 50

yea call her and go step by step and see what you're doing wrong

Answer 51

ok