Every person at a party of twenty eight people said hello to each of the other people at the party once. How many "hellos" were said at the party?

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.

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Aline that intersects one of two parallel lines intersects the other also always sometimes never