Suppose you have a data set that includes the values, 20, 30 and 50. if you add a fourth value to this data set, and after doing that the mean of the data set is 50, what was the value that you added?
a. -10
b. 40
c. 50 or
d. 100

so firstly, we need to isolate the y variables to be able to solve these inequalities. firstly, add 0.5x on both sides of the first inequality and subtract 1.5x on both sides of the second inequality:

now since the slope is positive for the first inequality, this means that the line going upwards belongs to the first inequality, and the line going downwards belongs to the second inequality.

next, since y ≥ in the first inequality, this means that the shaded region will be above the first inequality's line, thus shading regions a and b.

next, since y ≤ in the second inequality, this means that the shaded region is going to be below this line, thus shading regions a and c.

since both lines shade region a, this means that region a is the solution.

step-by-step explanation:

mark brainliest!

correct answer is b. 27/8

step-by-step explanation: