A student performed row operations on a matrix as shown below.
1-4 1 24 -4. Ll
0 -1 3 1 0 -1 3 11
3 2 45 30 107
Which operations did the student perform?
2R2+R3 R3
2R3+-R3 R3
2R2+R3 R2 R3
2R2 R3

Three coins are flipped. what is the probability that there will be at least two tails?

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

Finally, the arena decides to offer advertising space on the jerseys of the arena's own amateur volley ball team. the arena wants the probability of being shortlisted to be 0.14 what is this as a percentage? what is this as a fraction? what is the probability of not being shortlisted? give your answer as a decimal.