People use water to cook, clean, and drink every day. An estimate of 19.4% of the water used each day is for cleaning. If a family uses 67.9 gallons of water a day for cleaning, how many gallons do they use every day?

350 gallons

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.