The answer to your question is the letter A
5x+13=-42 is the equation.
5x=-55
x=-11. So the answer would be 11 of the small gray squares.
Explanation:
The Cenozoic period saw the demise of non-avian species of dinosaur and the emergence of humans. It is characterized at the late cretaceous period period of other main species and the end of the Pleistocene Epoch by the Cretaceous-Tertiary mass extinction event. The age of fresh start however is in this era.
