An engineering team has a goal of installing new, more efficient solar panels on the International Space Station. Which equation best describes a cost-
benefit analysis the team might perform?
A. Improved efficiency + manufacturing expenses - fuel to reach
orbit = net benefit
B. Improved efficiency - manufacturing expenses - fuel to reach
orbit = net benefit
C. Improved efficiency - manufacturing expenses + fuel to reach
orbit = net benefit
D. Improved efficiency + manufacturing expenses + fuel to reach
orbit = net benefit

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

Which of the choices below is one of the primary gases found in the atmosphere? a. helium b. carbon dioxide c. nitrogen d. argon

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?