Asingle tree produces about 2.6 × 10² lb of oxygen each year. the amazon rainforest has about 3.9 x 10^11 trees. about how many pounds of oxygen are produced in the rainforest each day ? enter your answer in the blank 2.8 × 10 ^blank lb remember these are scientific notations no exponents.

What is the product of the radical expression. (7-2square root) (8+2 square root)

Aflower has 26 chromosomes. to create a new flower, how many chromosomes would a sperm cell have? what is this process called? part 2: within a flower cell that has 26 chromosomes, how many chromosomes would a cell that is created within the stem of a flower as it grows, have? what is this process called?

Square a has a side length of (2x-7) and square b has a side length of (-4x+18). how much bigger is the perimeter of square b than square a?and show all work! you so