HELP WILL MARK BRAINLIEST The measure of an angle is 51.7º. What is the measure of its complementary angle?

(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

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

What percent of 18 is 24? and plz explain thx.