Which situation models combining a number and its additive inverse to make 0? a. after spending $20.00, marjorie has $20.00 left in her wallet. b. the temperature at midnight was –8°f. the temperature decreased 8°f by morning. c. tim has $25.00 in his bank account. he withdraws $25.00 from his bank account and gives it to his mother. d. an airplane is at an altitude of 50,000 feet. an hour later, the airplane is still at an altitude of 50,000 feet.

Questions 9-10. use the table of educational expenditures to answer the questions. k-12 education expenditures population indiana $9.97 billion 6.6 million illinois $28.54 billion 12.9 million kentucky $6.58 billion 4.4 million michigan $16.85 billion 9.9 million ohio $20.23 billion 11.6million 9. if the amount of k-12 education expenses in indiana were proportional to those in ohio, what would have been the expected value of k-12 expenditures in indiana? (give the answer in billions rounded to the nearest hundredth) 10. use the value of k-12 education expenditures in michigan as a proportion of the population in michigan to estimate what the value of k-12 education expenses would be in illinois. a) find the expected value of k-12 expenditures in illinois if illinois were proportional to michigan. (give the answer in billions rounded to the nearest hundredth) b) how does this compare to the actual value for k-12 expenditures in illinois? (lower, higher, same? )