for i=1---------------- > 4*(1/2)^(1-1)=4*(1/2)^(0)=4*(1)=4
for i=2---------------- > 4*(1/2)^(2-1)=4*(1/2)^(1)=4*(1/2)=2
for i=3---------------- > 4*(1/2)^(3-1)=4*(1/2)^(2)=4*(1/4)=1
total=4+2+1=7
the answer is
the value of this equation in the image is 7