18. The combined mean and variance of 250 workers of city A and city B are 560 and 5497 respectively. The mean and the variances of the salary of 100 workers of city A are 650 and 17 respectively. Find the variance of the salary in city B.​

21/58.

hope to be marked brainliest

the system of inequalities is

step-by-step explanation:

step 1

find the equation of the dashed line

we have the points

(0,0) and (3,1)

the line passes through the origin, so, is a direct variation

find the slope

the equation of the dashed line is

the solution of the inequality a s the shaded area above the dashed line

therefore

the equation of the inequality a is

step 2

find the equation of the solid line

we have the points

(4,0) and (0,4)

find the slope

the equation of the solid line is

the solution of the inequality b s the shaded area below the solid line

therefore

the equation of the inequality b is

step 3

the system of inequalities is

thats one

step-by-step explanation: