I need help finding the confidence interval

Sylvia rented a boat for $16.50 per hour. her total rental fee was $49.50. for how many hours did sylvia rent the boat

Write an equation in slope-intercept form using the given points (19,-16), (-7,-15)

At the height of about 212 meters one shell square is the tallest building in new orleans marlin is creating a scale model of this building using the scale 250 meters = 1 meter to the nearest tenth of a meter what will be the height of the scale model