A number scientific notation has to be between 1-10 and 1.73 is. Start at the end of the number and move back until you get to 1.73. Moving left/backwards gives you an positive exponent and moving right/frontwards gives you an negative exponent. Since you moved back 8 spaces you have 1.73 * 10^8
False because to find a reciprocal u gotta divide that number by one (example: 1 divided by 8 is 1/8) there you go , so therefore the answer is false. :)