Evaluate the dot product of (7,5)and (-5,4)

To evaluate the dot product of (7,5) and (-5,4)
this can be written in vector form as:
7i+5j and -5j+4j
thus the dot product will be:
(7i+5j)*(-5j+4j)
=(-5*7)+(5*4)
=-35+20
=-15
thus the answer is -15

You need to show the box plots

Hello!
volume of sphere =4/3.pi.r^3