Which of the following numbers must be added to complete the square in the equation below?

x²+18x= -27

a. 18 b. 9 c. 54 d. 81

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Solve -.016x= -16. need solving this