Li went for a mountain-bike ride in a relatively flat wooded area. she rode for 6 km in one direction and then turned and pedaled 16 km in another. finally she turned in the direction of her starting point and rode 8 km. when she stopped, was it possible that li was back at her starting point? explain.

What is the equation of the graph below? y=sec(x)-4

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.