How can you switch from editing the header and footer back to editing the main text of the document

When the pc version of the spreadsheet program became available, the ibm pc quickly became the top-selling personal computer?

Read the code below. what will the computer print if the input for year_variable is 1700? if year_variable == 1776: print("your answer is correct. the declaration of independence was signed in “year_variable”.") elif year_variable < 1776: compute_variable = 1776 - year_variable. print("add “compute_variable“ years to your answer for the correct answer.") elif year_variable > 1776: compute_variable = year_variable - 1776 print("subtract “compute_variable” years from your answer for the correct answer.")

Need fast im timed in a paragraph of 125 words, explain at least three ways that engineers explore possible solutions in their projects.