If 50 is the first number, what is the second number?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1

What does independent variable and dependent variable mean in math?