Solve for x.
-1+4x5= 3

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor