The sum of two numbers is 77. the greater number is 5 more than the smaller number. which equation can be used to solve for the smaller number?
x(x − 5) = 77
x(x + 5) = 77
x − (x + 5) = 77
x + (x + 5) = 77

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min

Need solving this 2nd limit problem.