We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
293
1
avatar+4116 

Help.

 Jan 4, 2018
 #1
avatar+101405 
+1

13.....

 

y  =  - 16x^2 +  95x + 10 

 

The x value that maximizes the height is given by   -95/ 2(-16)   =  -95/-32  =  95/32

 

So....subbing this back into the function, we can find the max height  =

 

-16 (95/32)^2  + 95(95/32)  + 10  =  151.02 ft

 

It will hit the ground when

 

-16x^2  + 95x  +  10  =  0

 

-95 ±√ [ 95^2  -  4(-16)(10) ]

--------------------------------------

               2(-16)

 

 

-95 ±√ 9665

__________       =    [ take the negative root]

       -32

 

-95  -  98.3

__________         =    6.04 sec

     -32

 

 

 

14.....this parabola turns upward so we can eliminate the first two answers

 

Using   (2, 15)   ....the  last  equation  gives

 

4(2)^2  - 3(2)  +  5

 

16  -  6  +  5

 

10 +  5  =   15

 

So.....the last answer is correct

 

 

cool cool cool

 Jan 4, 2018

18 Online Users

avatar
avatar