How to put 348 in scientific notation

Which of the following could be the graph of the equation y = -2x + 5

In the equations, a and b represent the price per night for a room in hotel a and hotel b, respectively, w weeks after september 1 last autumn. what was the price per night in hotel a when it was equal to the price per night in hotel b? a = 240 − 20w b = 320 − 30w

Hi my sisters and brothers can tell me the answer because i don’t understand the question