Asingle tree produces about 2.6 × 10² lb of oxygen each year. the amazon rainforest has about 3.9×1011 trees.
about how many pounds of oxygen are produced in the rainforest each day ?
enter your answer in the box. 2.8 × 10 ? lb

The table shows a pattern of exponents. what is the pattern as the exponents decrease?

Which of the following is the equation that says that the product of a number and ten is equal to 20 percent of that number ? a) 10n= 2.0n b) 10+n=.20n c) n+ .20n=10 d) 10n=0.20n

Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain