10 ft, 12 ft, 14 ft
unique
more than one
no tringle

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.

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,