It would be 1,200 because you just have to multiply 400 times 3 hope it helped :)
Can you describe it a little more- I have no clue how I’m suppose to solve that.
Answer:

Step-by-step explanation:

Adding both equations will make it:

Putting x = 10 will make it:

= 3(1000)-40+1
= 3000-39
= 2961
5x^2 + 6x +13.88 is what is is simplified hope it helped a bit