Ashade of green paint is to be mixed with 3 parts blue and 2 parts yellow. ten gallons of paint are to be mixed. how many gallons of yellow paint must be used ?

if 3 parts blue and 2 part yellow equals 1 gallon then 20 parts yellow would be needed to make ten gallons.

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)