Answer:
She didn't put the sign's in the proper place, it should be ( x + 3 ) ( x - 7 )
Step-by-step explanation:
( x - 3 ) ( x + 7 ) = x² + 7x - 3x - 21 = x² + 4x - 21
( x + 3 ) ( x - 7 ) = x² - 7x + 3x - 21 = x² - 4x - 21
Answer: x-9
Step-by-step explanation: because x is lower than Tony's money you would have to subtract x (Michelle's money) from Tony's ( which is 9)
This is why the answer would be X-9
Hope this helps!!!
37% out of 87% equals to 42.5
Solution :- Given differential equation

So the characteristic equation will be
![r^{2} -16=0 ⇒r^{2} =16 ⇒[tex]r_{1}=4 \\or \\ r_{2}=-4](https://tex.z-dn.net/?f=r%5E%7B2%7D%20-16%3D0%3C%2Fp%3E%20%3Cp%3E%E2%87%92r%5E%7B2%7D%20%3D16%3C%2Fp%3E%20%3Cp%3E%E2%87%92%5Btex%5Dr_%7B1%7D%3D4%20%20%20%5C%5Cor%20%5C%5C%20r_%7B2%7D%3D-4)
so, the required function will be

⇒
ia solution of the given differential equation
where
are constants.