Make a conjecture for this scenario

The product of two even numbers

What is the sum of these mixed numbers 2 1/8 + 4 3/8

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible