Your brother is correct, because the sequence is increasing.
The given information is
When she adds 2 to both sides, the equation
![4x=3x](https://tex.z-dn.net/?f=%204x%3D3x%20)
Subtracting 3x to both sides
![4x-3x=3x-3x](https://tex.z-dn.net/?f=%204x-3x%3D3x-3x%20)
![x=0](https://tex.z-dn.net/?f=%20x%3D0%20%20)
So the equation has exactly one solution which is
![x=0](https://tex.z-dn.net/?f=%20x%3D0%20)
Answer:
Sue must score 94 on the final test to earn a B.
Step-by-step explanation:
There are five tests in total.
Sue's average on the first four tests is 84.
If after the final test, she scores X, she will have a B on average of five tests.
We have the following equation:
86 = (4 × 84 + X)/5
<=> X = 5 × 86 - 4 × 84
=> X = 94
The estimated square root of 250 is 15.8113883 or 15.81
I am thinking is C but I am still not sure