Isosceles ABC ; the exterior angle of one base angle is 120°; AB=15. Find the numerical value of the radius of the inscribed circle.

What is the standard form of -5x^2+2x^4-11+x^3+3x

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

A. what does the point (4, 122) represent? b. what is the unit rate? c. what is the cost of buying 10 tickets?