How do you solve x^4-16x^2-720=0

How many combinations of a president, vice-president, secretary, and treasurer can be chosen from a group of 12 students? a. 11,880 b. 95,040 c. 665,280 d. 3,991,680

Solve x2 + 6x = 9 for x by completing the square. a. x = - 6 b. x = 0 c. x equals plus or minus square root of 18 minus 3 d. x = x equals plus or minus square root of 18 plus 3

Polly and Molly are writing letters to all of the athletes they love most. They have a list of 15 athletes, and Polly has already written 2 letters. Molly has written 4 letters.

The circle shown below has a diameter of 18 centimeters. What is the approximate area of the shaded sector? A. 763 cm2 B. 509 cm2 C. 212 cm2 D. 191 cm2

Why must eye protection be worn at all times in welding shop?

What's the sum of - 4 and 14

If a cube has a volume of 64 cubic units how long is its edge?

Which of the following are solutions to the equations below? x^2+x-20=0

What does the 3 represent in 3 (20 15) ?

the beach shop sold 12 skim boards on saturday and 9 on sunday. What is the percent of decrease from saturday to sunday?