Need fast yesterday's afternoon temperature was 21°f. it plunged overnight to -3°f. how many degrees did the temperature drop?
a) 3°
b) 18°
c) 21°
d) 24°

The Answer to all the questions are D C D D B

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,