Tell which number is prime: 39, 69, 89, 90.

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

1. the wheeling bridge in west virginia is about 307 meters long. if you walk with a stride of about meter, about how many steps would it take you to cross this suspension bridge?

The length of triangle base is 26. a line, which is parallel to the base divides the triangle into two equal area parts. find the length of the segment between triangle legs.