What are the like terms in this expression?

9a - 3b + 4ab

What’s the domain of this function? fastttt

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

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?