Need ill upvote
triangle abc is similar to triangle def . the length of bc is 21 cm. the length of de is 10 cm. the length of ef is 14 cm.
what is the length of ab?

Acable company wants to provide cell phone service for residents on an island. the function for the cost of laying the cable from the island to the mainland is c(x)= 6.500 square root x2+4, where x represents the length of the cable in feet. what are the domain and range of the function? a) domain: all real numbers range: all real numbers greater than or equal to 17,000 b) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 17,000 c) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 13,000 d) domain: all real numbers greater than or equal to 13,000 range: all real numbers greater than or equal to 0

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

I’m stuck on this equation, anyone got the answer?