Question 198881
r^3/2 is the square root of r cubed.  All we have to do is plug in the values.
am^2+r^3/2, m=2, a=7, r=4, so we have 7*2^2+4^3/2.  We multiply and divide before we do any addition according to the laws of mathematics.  So, 
28+8 (see above)=36.