What is the answer? - 15+9-12

A football team lost 9 yards on its first play. It then gained 9 yards on its second play. A. What expression can be written to represent how many yards the football team is from where it started? Explain your reasoning. B.

So, in Math I am learning Scientific Notation. Can someone show an example and some tips for me as well as the steps to remember how to turn things into and out of the Scientific Notation form? Thanx a bunch!

How many circles are drawn in the construction of a regular hexagon?

Susan takes care of a child for 2 hours after school each weekday and 6 hours on Saturday. How much will she earn in 5 weeks. If she earns 2.50 per hour

4. Show that in any group of n people there are at least two people who have the same number of friends in the group.

Hourses a clydesdale drinks about 120 gallons of water every 4 days at this rate, about how many gallons if water dies the clydesdale drink in 28 days?

Jessica is printing invitations to a graduation party. She needs to print 250 invitations one per sheet of paper. She was only able to purchase 5 packages of 25 sheets of paper at the store.

Jacob painted 30% of a banner. luis painted an equal amount of the same banner. the rest of the banner remains unpainted. write a fraction to describe the amount of banner that remains unpainted?

What is the answer for -4^2 (negative 4 with exponent of 2) and (-4) ^2 (in parentheses negative 4, then when parenthesis close, it says exponent of 2)

If I have 25 marbles and I have to divide them for 25 people how much will that be