15. Doug Upp can shovel coal at the rate of 16 tons per day. His brother, Sid, can e rate of 16 tons per day. His brother, Sid, can shovel 10 tons per day.

a) Define a variable for the number of days Doug has shoveled. Then write an expres

umber of days Doug has shoveled. Then write an expression for the number of

tons Doug has shoveled. X=# days

b)

Three days later, Sid joins Doug, and both shovel together. Write an expression for the num

days Sid has been shoveling in terms of your variable in part a. Then write an expression for the

number of tons Sid has shoveled.

C) Write an equation stating that the total number of tons Doug and Sid have shoveled is 100. Then

solve the equation to find out how many days Doug dug when they have shoveled this much coal.

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? )