Why three prime numbers equal 30

In triangle abc, a=16 m, b=18m, and c=20 m. find the area

The first side of a triangle is twice the second, and the third is 20 feet less than three times the second. the perimeter is 106 feet. find the three sides.

There is a happy family consisting of 2 parents and kids. The average age of the family is 20. But if we exclude one parent whose age is 40, the average age of the family drops to 15. Find the number of kids in the family.

If you pay 5% sale tax on three items have you paid a total of 15% sales tax? why or why not

At a spring concert, tickets for adults cost $4.00 and tickets for students cost $2.50. how many of each kind of tickets were purchased if 125 tickets were bought for $413

5.69 divied by 7 long Division

Using the law of Sines, in triangle ABC, is angle C=145 degrees, b=7, c=33, what is angle B

Nelson has half of his investments in stock paying a 6% dividend

Wayne has a total of 100 Major League Baseball cards from both the American League and the National League. The number of American League cards is 10 more than twice the number of National League cards.

What is 4/8 in lowest terms