No more than 18 people are allowed in the gallery at one time. write a inequality

(note i put the graph in so plz )the graph shows the amount of water that remains in a barrel after it begins to leak. the variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel. what is the slope of the line

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

Somone me i want to know what 18 hours out of 24 hours in a fraction