30 POINTS PLEASE SOLVE please explain step by step 1. solve the following PROBLEM (meaning #1 ) using the order of operations A. Expression 1 solve- 3^4-(9+ 6)⋅5+4^0 B. Expression 2 solve- 5^2+ 4⋅(2+6)-2⋅2-1 2. The average distance from the sun to the planet Mercury is about 60,000,000 km. The diameter of a human hair is about 0.0025 cm. (a) What is the distance from the sun to Mercury written in scientific notation? (b) What is the diameter of a human hair written in scientific notation? (c) Bonus Question – To subtract the measurements in Parts (a) and (b), what do you have to do first? 3. The population of Columbus, Ohio, in 2014 was about 825,000. The population of the United States was about 320 million in 2014. (a) Write each population in scientific notation. Columbus, Ohio: The United States: (b) About how many times larger was the population of the United States than the population of Columbus, Ohio? Show your work!