Answer :
7.8X10^8-5.8X10^7 is the same as:
7.8X10^8-0.58X10^8 which is equal to:
(7.8-0.58)(10^8)
(7.22)(10^8)
7.22X10^8 (about 722 million miles difference)
7.8X10^8-0.58X10^8 which is equal to:
(7.8-0.58)(10^8)
(7.22)(10^8)
7.22X10^8 (about 722 million miles difference)