Prove that a square matrix is invertible if and only if its columns are linearly independent

A truck driver makes a trip that covers 2,380 km in 28 hours. What is the driver's average speed?

When the consumer price index (cpi) decreases from 250 to 150, prices decrease by 100%. True or false?

A triangle has sides of 2 inches and 7 inches which is a possible lenght, in inches of the third side of the triangle

The table below shows different possibilities for the number of games a team would need to win to maintain a certain percentage of wins Table: Number of games won: 6, 24, 36, 42 Number of games played: 10,40,60,70 Which ratio of the games won to the

Find the percent of increase from 20 to 50

Suppose that a single card is selected from a standard 52-card deck. what is the probability that the card drawn is a club ? now suppose that a single card is drawn from a standard 52-card deck, but it is told that the card is black.

How do you write 70% as a fraction or mixed number in simplest form?

All are Algebra 1 questions. What is x? 1. 7 (x-5) - 2 = - 100 2. 2x+6 (5x-5) = 130 3.-5x+3 (-4x-11) = 137 4.2 (x+9) - 15 = - 3 5. 5-3 (x-7) = 32 6.3-3 (x-5) = 60 7.2x-2 (-3x+3) = 58 8. 5x-3 (-6x+5) = - 130

On a scale drawing, 1/4 inch = 2 miles. On the drawing, how many miles are represented by a line that is 3 1/2 inches long? A 7 miles B 12 miles C 14 miles D 28 miles

If y varies inversely as x and y = 8 when x = 9, find x when y = 12.