Answer:
The intensity of 4 lawn movers is 86 dB.
Explanation:
Intensity of one lawnmower = 80 dB
Let the intensity is I.
Use the formula of intensity

Now the intensity of 4 lawn movers is
1050kg sorry Ik this is not correct
Answer:
B 1500N
Explanation:
The acceleration of the car - at least the average one, but that will do, is 
We know the acceleration, we know the force, let's drop them in Newton second law.
