If f(x1)+f(x2)=f(x1+x2) for all real numbers x1 and x2, which of the following could define f?
a) f(x)=x+1
b)f(x)=2x
c)f(x)=1/x
d)f(x)=e^x
e)f(x)=x^2

i have no idea how to go about this, if someone can explain it to me.

The conversion factor relating feet to meters is 1 ft=0.305 m. keep in mind that when using conversion factors, you want to make sure that like units cancel leaving you with the units you need. you have been told that a certain house is 164 m2 in area. how much is this in square feet?

During your cycling trip, you and your friends often stayed in hostels. the prices of these are listed below. hostel standard room (price per night) with breakfast (price per night) super sleep hostels £22.45 £28.65 normandy nights £18.55 £25 zzzola hostels £24.50 £30.99 belgian beds £11.20 £18.55 night-time rest days ? £33 what is the range in cost for a single night, including both standard room prices and with breakfast prices?

Solve -2(4y + 6) = 52. 5 -5 8 -8 and !