A map of a burned area obtined from remote sensing contains, Ask an Expert

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Q. A proton moving at 3.90 106 m/s through a magnetic field of magnitude 1.80 T experiences a magnetic force of magnitude 8.80 10-13 N. What is the angle between the proton's velocity and the field? (Enter both possible answers from smallest to largest.)

Q. A map of a burned area obtined from remote sensing contains 120 pixels. The remote sensing image shows that the fire is isolated to 73 of the 120 pixels.

a) how many km^2 of forest does the image represent?
b) how many km^2 of the forest is burned?
c) how many km^2 of forest remained after the fires?
I know that 1 pixel = 900m^2 but I do not know how to solve these problems.

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