Find the missing side. Round your answer to the nearest tenth

Which equation can be used to solve for the unknown number? seven less than a number is thirteen. n-7=13 7-n=13 n+7=13 n+13=7

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

If chord ab is congruent to chord cd, then what must be true about ef and eg?