How many ways are there to choose an open interval (p, q) of the real line, where both endpoints are integers in the range 1,...,50

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

The stairs leading from the ground to the entrance of a plane forms a right triangle with the ground. if the distance of the stairs measures 22 feet and the ground distance measures 11 feet, how high is the entrance to the plane from the ground? which diagram represents this scenario? / 22ft © 22ft 11 ft 11 ft 22 it

Is the ordered pair (-10, 7) a solution to the equation y = 17 – x? yes or no