Which of the following is a true biconditional statement? Х
A. A U. S. citizen votes if and only if the person is at least 18 years old,
B. A number is a real number if and only if it is a positive integer
C. If a figure does not have four sides, then the figure is not a square.
D. The product of two integers is odd if and only if the two factors are odd.

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

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? )

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.