Need with elementary row operations!
1. [(1,,-13): }|{: (1,,1)]-1/13r_2rarrr_2rarr
2. [(1,,2): }|{: (1,,1)]r_2+(-5r_1)rarrr_2rarr
next question, determine if the matrices are inverses of each other by multiplying the matrices.
1. a=[(0,,4)]
and b=[(-2,1/,0)]
2. x=[(4,,2)]
and y=[(1/4,/8,1/2)]

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

Choose the more precise measurement. 26.4 cm or 8.39 cm

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?