Please help!! I completely forgot how to do this and please show your work

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.

You are living in aldine, tx and you are planning a trip to six flags in arlington, tx. you look on a map that has a scale of 0.5 inches to 30 miles. if the map shows the scale distance from aldine to arlington is 4 inches, how far is the actual distance?

Aline passes through the point (9,-7) and has a slope of 4/3 write an equation in point-slope form for this line. first to answer correctly gets brainleist