Linear equations and inequalities

The average age in the group of six persons is $48$ years. The average age of the first five of them is $51$ years. How old is the sixth person?

Choose the equation whose graphical solution is in the picture.

Assuming $x\in \mathbb{R}$, find the solution set of the following inequality. $$(x-2{)}^2+(2+x{)}^2\le 8+2x^2$$

We are given the inequality $2x+\frac{3-4x}{2}<\frac{7}{2}$. Decide which of the following inequalities is equivalent to the given inequality, i.e. which of the following inequalities was obtained from the given inequality by equivalent transformations.