Solve for x

x^2−18x+81=0

The average human heart beats 72 beats per minute. how many times does it beat in 15 seconds?

Which of the following situations represents a linear relationship? a. theresa increases the distance she runs by 0.1 miles every week. b. the volume of a box depends on the length of box. c. the amount of money in a bank account increases by 1 percent each year. d. the population of a town doubles every 5 years.

What are the domain and range of the function f(x)=2^x+1