What is the digit in the units place of the sum of 1^1 + 2^2+ 3^3 + 4^4 ++ 99^99 +100^100

The scale for a map is 20 miles = 1/2 inch. the distance between two towns on the map is 3 3/4 inches. what is the actual distance between these towns? 150 miles 38 miles 75 miles 135 miles

Compare the following pair of numbers a and b in three ways. a. find the ratio of a to b. b. find the ratio of b to a. c. complete the sentence: a is percent of b. a=120 and b=340 a. the ratio of a to b is . b. the ratio of b to a is . c. a is nothing percent of b.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.