How can you use a pattern to add 20+30+40+50+60+70+80

Here is my question! jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?

Which expression is equal to (f+g)(x)?

Suppose the equation ||x-a|-b|=2008 has 3 distinct real roots and a not =0. find the value of b.