Another way to express the problem 1 - (-7)?

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

Norder to get a certain shade of blue paint, a mixer must have 5 parts white paint to 3 parts blue. if 4 gallons of paint must be mixed, how many gallons of white paint must be used?

Given that the images represent 4 steps in the construction of a line segment congruent to a given line segment, which is step 3 in the construction?