What do diffraction and refraction have

A map has a scale showing 3 inches represents 11 km. How many miles apart are the cities that are 9.7 inches apart?

A recent study by Allstate Insurance Co. finds that 82% of teenagers have used cell phones while driving (The Wall Street Journal, May 5, 2010). In October 2010, Massachusetts enacted a law that forbids cell phone use by drivers under the age of 18.

The population of Riverdale is 6,735. What is the value of the 7 in the number 6,735?

What is the date of the fifth Monday in September

The length of the hypotenuse of a right triangle is 157 units. The length of one leg of the triangle is 132 units.

What is 9, 0 0 3, 840, 165, in expanded form

State whether the relationship between x and y in y=4x-5 is proportional or nonproportional

Last year Big bills department store sold many pairs of shoes 118,214 Pairsof boots were sold; 37,092 more pairs of sandals than pairs of boots were sold; and 124,417 more pairs of sneakers than pairs of boots

What is the unit rate of $74.75 rounded to the nearest whole number.

Ninety-two passengers rode in a train from City A to City B. Tickets for regular coach seats cost $112. Tickets for sleeper cars seats cost $287 The receipts for the trip totaled $18,529. How many passengers purchased each type of ticket?