Which statement best describes an advantage of describing a system with a mathematical model? A. It simplifies the system by describing only one variable at a time. B. It allows people to manipulate something that looks like the actual system. C. It enables people to calculate how a change in one variable will affect other variables. D. It helps people visualize the way that systems are interconnected.

Sarah wants to know where in her garden chamomile would grow the best. she thinks chamomile will grow best in the corner of the garden that gets the most sunlight. to test her hypothesis, she decides to plant several groups of chamomile in her garden as an experiment. which of the following variables will sarah need to measure to know which group of plants grew best? a. the location of the plants b. the type of plants c. the height of the plants d. the amount of water she gives the plants

What is the temperature of one mole of helium gas at stp?

The rate constant for the reaction below is 6.2 x 10−5 mol l−1 s −1. if the initial concentration of a is 0.0500 m, what is its concentration after 115 s?