How to tell when to use positive or negative symbols when dividing?

Joe is 5 years older than sally. in 15 years joe will be 3 times as old as sally is now. how old is sally now

Simplify: a+2a+3a+4a

If the sales tax is 5% what is the sales tax on clothing that cost 170

Find three rational numbers between - 3 and - 2

All real numbers that are at least 2 and at most 9

A car travles 75 miles on 3 gallons of gasoline how much gasoline will it need to go 342 miles

The annual rainfall in a certain area is normally distributed with mean 40 and standard deviation 4. what is the probability that starting with next year, it will take over 10 years before a year with annual rainfall over 50 occurs?

Hannah reads at a constant rate of 3 pages every 8 minutes. Write an equation that shows the relationship between p, the number of pages she reads, and m, the number of minutes she spends reading.

The (blank) is calculated by putting the data in order and selecting the middle value.

How many different breakfasts can you have at the local diner if you can select 3 different egg dishes (scrambled, fried, poached), 4 choices of meat (steak, ham, bacon, sausage), 5 breads (white, wheat, rye, muffin, bagel), 6 juices (tomato, grape,