M(x) -x2 + 30x + 100 where m(x) is the number of pieces of junk mail (in thousands) and x is the number of years after 1980

google dat sis

step-by-step explanation:

you can't solve x because it is 2 linear equation and you only have one equation

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.