the map of a county highway is shown. There are no traffic lights for 4 of the miles. For the rest of the highway, there are sets of traffic lights every 1/2 mile. How many sets of traffic lights are on the county highway?​

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?

What is the value of x? enter your answer in the box.

The coverage of a base station of a telecommunication company forms a disk with a radius of (kilometers). let be the distance of a cellphone from a base station. assume that the location of cellphones in use are randomly uniformly distributed within the disk. calculate the mean and variance for the random variable.