(4/5)^2+ 2/5 ÷ 1/2( these are fractions and the 2 is a exponent) hurry up please

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart