Can some factor these for me?

a2 - 9a + 20

9 - 6a - 24a2

You and your friend get the same magazine. You spend $15 for twelve issues. Your friend pays $1.50 per issue but gets the first two issues free. How many issues will your friend get if he also spends $15?

A science textbook uses a scale of 3cm=2mm for drawings of small insects. What is the actual length of a flea if the drawing is 7.5cm long?

International Juice Inc. plans to introduce a new line of fruit juices with three different flavors: cherry, grape and apple. 50% of buyers will buy cherry, 20% will buy grape, and 30% will buy apple. Cherry buyers will buy an average of 1.

Ann worked 20 hours and made $200. how much money does she make per hour?

Exaplain how you can determine whether three metal rods can be join to from a triangle

Both Wilma's and Betty's pools hold 9000 gallons of water. If Wilma's garden hose fills at a rate of 750 gallons per hour while Betty's garden hose fills at a rate of 650 gallons per hour, how much longer does it take Betty to fill her pool than

One person can do a certain job in six days, a second person can do the same job in two days, and a third person can do this job in three days. how many days will they take to do the job together?

What is the area of this circle

What is the interest earned on $12,000 invested at 5.25% simple interest for 5 years?

Factor the GCF: 12a3b + 8a2b2 - 20ab3