Tìm số chiều và số cột của 1 cơ sở W của không gian con sinh bởi hệ vector U

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Aremote-controlled boat can travel at 4 feet per second in calm water. the boat traveled 48 feet with the current, and then it traveled 16 feet against the current in the same amount of time. how fast is the current?

Atriangle has side lengths of x, x+11, and 3x+5. what is the perimeter? question 1 options: 3x2+38x+55 3x3+38x2+55x 5x+16 4x+16