A square bracket means that the interval includes that endpoint. Since in your problem both brackets are square, both endpoints are included. This interval goes from -4 to 10 and includes the endpoints -- on a number line, you fill in those endpoints. Alternatively, instead of filling in the endpoints, you can draw a bracket at -4 and another bracket at 10.

If the interval had included parentheses, you would not have filled in the circles (or if you used brackets/parens, you would have put a paren on the number line).

Here is the graph with the circles (both filled in):

https://homework.justanswer.com/view_imag…

First you need to understand what the symbols mean. A [ means to include the left side point. A ] means to include the right side point. A ( means the left side point is not included. A ) means the right side point is not included.

Now draw a number line and mark the two given X values -4 and 10 with an open circle (a little o). If the end point is a bracket, darken in the o. If the end point is a paren, leave the circle open. An open circle means "this end point is not included". Then darken in the line segment between the two points. In this case both end points are included in the plot.