By checking work records, a plumber finds that worker A can do a certain job in 12 hours. Worker B can do the same job in 9 hours. How long would it take if they worked together? can someone gave me a step by step explanation please?

correct answer is option b.

step-by-step explanation:

the true statement about geometric figure is option b that is one line can be drawn through all three points.

if three points are on the same plane, they can be connected by a line.

b mark me branliest thx

step-by-step explanation:

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,

the correct answer is $7.38

step-by-step explanation: