The number of diagonals of an n-sided polygon is given by the formula D= n/2(n-3). A polygon has 90 diagonals. How many sides does it have?

The sum of two numbers is 58. the first number is 8 less than half the second number. let  c  represent the first number. let  drepresent the second number. which statements about solving for the two numbers are true? check all that apply. the equation    represents the sum of the two numbers. the equation    represents the sentence “the first number is 8 less than half the second number.”the equation    represents the relationship between the two numbers. the equation    represents the sum of the two numbers. the number  d  is 14.the number  c  is 44.the number  c  is 14.the number  d  is 44.

Which system of linear inequalities is represented by the graph? !

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°