Which of the following is equivalent to the complex number shown above? The choices for the answer are :
i-4
i+4
-i-4
-i+4

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.