So, for the first problem, lets put the amount of degrees in relation to pi. Since 360 degrees equals 2pi, then 180 degrees equals 1pi, and 90 degrees equals 1/2pi. A third of 1/2pi is 1/6pi (30 degrees), 1/2 of 1/2pi is 1/4pi (45 degrees), and 2/3 of 1/2pi is 1/3pi.

For the second problem, if the base is given to you with two unknown sides, you can find the height of the triangle.

h is the height, and a is the base. I believe you learned the pythagorean theorem back in 5/6th grade, so in order to find each side, the equation is: (1/2a)^2+(h)^2=b^2, and solve from there.

If the height is unknown, hopefully they gave you one of the angles. Then you could use trigonometry and find the length of the height.

For the third problem, I do not believe you are graphing on a number line. I believe you are graphing on a coordinate plane.

In order to graph a linear equality, you have to graph the slope of the line. So, for 5x+y>40, subtract 5x on each side and get y>40-5x.

To graph y>40-5x, graph the equation y=40-5x. Then, since y is greater than 40-5x, you shade everything above the line you drew, since every point above the sloped line is a valid solution.

Should look like this:

*For reference, graphing an inequality on a number line usually only involves one variable. Correct me if I'm wrong.

If you have any questions, feel free to ask me! (and sorry for the late response!)