Insert three arithmetic means between -16 and 4.

Three arithmetic means between -16 and 4 are : 20 , 10 and  

Step-by-step explanation:

we have to find out three arithmetic means between -16 and 4

-16 , ____  , ____ , ____ 4

so , lets take the mean like this ,

-16 ,  -16+d , -16+2d ,-16+3d , 4

First mean -: -16 +d = 4

                   d= 4+16

                   d = 20

second mean -: -16 +2d = 4

                            2d=  4+16 = 20

                             d=

                             d= 10

third mean -: -16+3d = 4

                         3d = 20

                          d=

Therefore , all the three arithmetic means between -16 ad 4 are 10 , 20 and   .