What is the factored form of a2 - 121?

(a - 121) (a - 1)

(a - 11) (a + 11)

(a + 11) (a + 11)

(a - 121) (a + 1)

Perform the calculation. 90° - 47°41'

The mean length of long-distance telephone calls placed with a particular phone company was known to be 7.8 min under an old rate structure.

A 12-sided die is rolled. The set of equally likely outcomes is {1,2,3,4,5,6,7,8,9,10,11,12}. Find the probability of rolling a number less than 11.

Write an equation that represents the line (0,-3) (1,-5).

There are (26) 3 ⋅ 20 bacteria in a sample. What is the total number of bacteria in the sample?

Multiply (5x-1) (6x^2+3x+7) SHOW WORK

Muriel collects rainwater in a large barrel that weighs 20 pounds. When there are 10 gallons of water in the barrel, the total weight of the barrel and the water is 103.4 pounds. When there are 20 gallons of water, the total weight is 186.8 pounds.

The number x is reduced by 25% and then halved

Bruno correctly answered 4 questions out of every 5 questions on a test. write the ratio of questions that Bruno answered correctly to the number of questions on the test

Solve x^2-6x+25 = 0 by completing the square.