Fernando had to pay $1.40 in sales tax when he purchased a shirt. If the sales tax rate is 7%, how much did his shirt cost? please show step by step

If 20% of a number is 35, what is 50% of that number?

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?