The first term and the last tems of an A.P. are 17 and 350 respectively. If the common difference is 9,how many terms are there and what is their sum ?

A college turtoring center pays math tutors $5.15 per hour. tutors can earn an additonal $1.20 per hour for each hour over 40 hours. A math tutor worked 42 hours one week and 45 hours the second week. How much did the tutor earn in this two-week period?

l asked a grandfather about his age. He told me: My grandson age in days equal to the age of my son in weeks and at the same time my grandson's age in months equals my age in years. If all three ages are 100 years, what was the age of the grandfather?

On the first day of the month, Michael places 5¢ in a jar. The next day, he places 7¢ in the jar. The third day, he places 9¢ in the jar, and so on for 24 days. What amount will be in the jar at the end of this period of time?

In Linguistics 101, the ratio of the number of juniors to the number of seniors is 3:2. When six more juniors join the class, and one senior drops the class, the ratio of the number of juniors to the number of seniors becomes 2:3. How many students are in the class after these changes?

Kellie is on a strict diet in preparation for surgery. She has to monitor her weight daily for 5 days. She weighed 224 1/2 pounds on Monday. She lost 1/4 pound on monday. She gained 1 1/4 pounds on Tuesday, and on Wednesday she lost 1 3/4 pounds. Thursday, she lost 1/2 of a pound, and on Friday she gained 1 3/4 pounds. How much did she weigh after her Friday weigh in?

Jenny is now 18 and Carmen is 12. How many years ago was Jenny twice as old as Carmen?

The military uses a 24-hour clock to avoid the problems of "A.M." and "P.M." For example, 1100 hours is 11 A.M., while 2100 hours is 9 P.M. (12 noon + 9 hours. In these designations, the last two digits represent minutes and the digits before represent hours. Find the sum in the 24-hour clock system.

Suppose a student got an 82 on an exam that was worth 25% of the final grade, a 75 on another exam worth 25% of the final grade, and 93 for a homework score worth 10% of the final grade. They only have the final exam left, which is worth 40% of the final grade. What score is needed on the final exam to get a 90 for a final grade?

2 A recipe calls for 4 of a cup of flour to make one batch of doughnuts. If Cecilia wants to make 9 batches of doughnuts, how much flour will she need?