Triangular numbers can be represented with equilateral triangles formed by dots. the first five triangular numbers are 1,3,6,10,and 15. is there a direct variation between a triangular number and it's position in the sequence? explain your reasoning.

What are the exclude value of mn+3m

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)