Can u plz i'm failing and i have 2 weeks to get my grades up someone me plz plz plz plz this is not a test ok it was hw and then i got extra credit and a lot of other stuff but plz me plz plz plz plz

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

However, had it been a real sound, the sound's pitch would have been increased by the doppler effect, since the falcon was moving the source of the sound. perpendicular to away from towards at the same speed as

Could someone . i have tried to solve myself but my calculation is off