In order to measure the height of a large tree, Adrian measures the tree's shadow and immediately measures the length of his shadow and his height. What is the height of the tree

Anyone know? will mark brainliest if correct

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning