In a classroom 4 students are wearing red shirts, 11 students are wearing blue shirts, and 10 students are wearing black shirts. what is the ratio of wearing black or red shirts to blue shirts?

The triangles are similar. what is the value of x? show your work.

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?