Answer:
9x + 5y
Step-by-step explanation:
Here, in 2x + 5y+ 7x, the 'like terms' are 2x and 7x, and the sum of these terms is 9x. Thus, 2x + 5y+ 7x becomes 9x + 5y.
Answer:
Sum means to ADD in the math world
Step-by-step explanation:
So your answer would be d + 9
Yea because every input has only one output