Does the ratio 4/7 to 8/9 has a unit rate of 9/14

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

Draw a tape diagram to represent each situation.for some of the situations,you need to decide what to represent with a variable andre bakes 9 pans of brownies.he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students