7. Let B = {(1, 2, 3), (2,0, 4), (1, 1, 1)}. Prove that B is a basis for R³ (since this is a proof, you must give an explanation, simply doing some algebra by itself is not enough).

Thank you, please answer (b)

I have this question on my homework and I don't see a pattern. I have to explain how the trick works.  "Think of a number. Add 17. Double the result. Subtract 4. Double the result. Add 20. Divide by 4. Subtract 20. Your answer will be your original number."

Angie got 7 more correct answers than sahil on the drivers education test. Sahil that 34 questions correct how many did Angie