in a pie eating contest, how many different ways can the gold medal for first place, the silver metal for second place, and bronze metal for third place be awarded if 18 contestants are eating pies?

Find the solution of system of equation y= x-4 y=4x+2

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?

Tan198=asin164=? how to solve this? ?