87 boys are in 8th grade of these, 43 play baseball, 42 play football, 47 play tennis, 15 play both tennis and baseball, 17 play both tennis and football, 21 play both baseball and football, and x play all three sports

Don't know how to find x given these segment lengths

Two line segments are shown in the figure below. suppose that the length of the line along the x-axis is 6, and the length of the hypotenuse of the triangle is 10. what is the equation of the hypotenuse line (shown in red, below)?

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?