If x2 + y2 = 25 and dx/dt = -2, then what is dy/dt when x

Introductory Chemistry 5
Write a balanced chemical equation for the reaction of gaseous nitrogen dioxide with hydrogen gas to form gaseous ammonia and liquid water.

College Physics 1
Problem 13PE Conversations with astronauts on the lunar surface were characterized by a kind of echo in which the earthbound persons voice was so loud in the astronauts space helmet that it was picked up by the astronauts microphone and transmitted back to Earth. It is reasonable to assume that the

Principles of General Chemistry 2
Problem 49P Strike anywhere matches contain the compound tetraphosphorus trisulfide, which bums to form tetraphosphorus decaoxide and sulfur dioxide gas. How many milliliters of sulfur dioxide, measured at 725 torr and 32C, can be produced from burning 0.800 g of tetraphosphorus trisulfide?

Principles of General Chemistry 2
Consider the following reaction energy \(diagram\): (a) How many elementary steps are in the reaction mechanism? (b) Which step is rate limiting? (c) Is the overall reaction exothermic or endothermic? Equation Transcription: Text Transcription: diagram

General, Organic, and Biological Chemistry: Structures of Life 4
Problem 72QP The molecules CH4 and CH3Cl both have tetrahedral shapes. Why is CH4 nonpolar whereas CH3Cl is polar?

Glencoe Accounting: First Year Course, Student Edition 1
Completing Period-End Activities The general ledger for Show biz Video shows the following at December 31: Instructions Using the preceding account names and balances: 1. Prepare the six-column work sheet. The period covered is one month. 2. Prepare the financial statements. Greg Fa

Human Anatomy & Physiology 9
Define hypersensitivity. List three types of hypersensitivity reactions. For each, note whether antibodies or T cells are involved and provide two examples.

Principles of Economics 9
Xavier opens up a lemonade stand for two hours. He spends $10 for ingredients and sells $60 worth of lemonade. In the same two hours, he could have mowed his neighbors lawn for $40. Xavier earns an accounting profit of _________ and an economic profit of _________. a. $50; $10 b. $90; $50 c. $10; $50