What is the least common multiple of 4 and 16

Which of the following is a justification used while proving the similarity of triangles lom and mon

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²