It takes 12 hours to clean the windows of a certain office building. during the
first day of cleaning, the workers were able to clean for 9 hours. if the variable
t stands for the amount of time the workers have left to clean the windows,
which of the following units could apply to this variable?

a. buildings
b. hours
c windows

pretty sure it is B bc it saud t stands for ant if time left

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.