)determine elementary matrices e1, e2, e3 of type iii such that e3e2e1a = u with u an upper triangular matrix. the matrix e1 should turn the element in position (2,1) into a 0. enter this matrix in matlab as e1 using commands similar to the ones in example 1. the matrix e2 should turn the element in position (3,1) into a zero. enter this matrix in matlab as e2. note that to zero out the entries in column 1, you need to add or subtract a multiple of row 1. once you have found the matrices e1 and e2, compute the product e2e1a in matlab. use format rat so that the entries will be given as fractions. based on the result, determine the matrix e3 that turns the

some have built technology like spoofed call blockers into their networks, so there's nothing you would even have to install.

this happens because the number is known for scamming, they don't want it to me known as "scam likely." perhaps it's just a telemarketer. maybe it's an identity thief. it might even be a scam artist.  

either way, "scam likely" is probably not an old friend whose number you forgot that you saved. it's your wireless carrier's way of letting you know: answer at your own risk.

explanation:

to combat the seemingly rising epidemic of spam callers in the u.s., the nation's four major wireless carriers have been trying out new methods to reduce the number of unsolicited calls americans receive each day.

some have built technology like spoofed call blockers into their networks, so there's nothing you would even have to install.

hope this . mark me brainliest.

answer; the correct answer is technician b;

well you didnt give us any options it looks like so im going to go with because cash cant be traced.