A jet flies at a rate of 1.3 x 10^ 6 feet per hour. Written in scientific notation, which is the best estimate of how many feet the jet will travel in 2.8 x 10^ 3 hours?

(1.3X10^6ft/hr) (2.8X10^3hr)

(1.3*2.8) (10^6*10^3)

Rule (a^b) (a^c) = a^ (b+c)

(3.64) (10^ (6+3))

3.64 (10^9)

3.64X10^9 ft

Technically we only had two significant figures and the answer should be:

3.6X10^9 if we were to express our answer to the correct number of significant figures ...

(1.3 * 10^6) (2.8 * 10^3) = (1.3 * 2.8) = 3.64 ... (10^6 * 10*3) = 10^9

3.64 * 10^9 <==