Use Identities to Write Each Expression as a Function of $\cos ( s - t )$

question 205

Multiple Choice

Use identities to write each expression as a function of .
-Find $\cos ( s - t )$ given that $\cos s = \frac { \sqrt { 10 } } { 10 }$ , with $s$ in quadrant $I$ , and $\sin t = - \frac { \sqrt { 3 } } { 2 }$ , with $t$ in quadrant IV.

• A) \(\frac { \sqrt { 10 } - 3 \sqrt { 30 } } { 20 }\)
• B) \(- \frac { \sqrt { 10 } } { 20 }\)
• C) \(\frac { \sqrt { 10 } - \sqrt { 30 } } { 19 }\)
• D) \(\frac { \sqrt { 10 } + 3 \sqrt { 30 } } { 20 }\)

Analyze the role of social identities and group membership in determining helping behavior.

Apply the concept of reciprocity in prosocial behavior.

Describe the effect of the presence of others on an individual's decision to help.

Understand gender differences in expressions of prosocial behavior.

---

Definitions:

GDP Deflator

A measure of the level of prices of all new, domestically produced, final goods and services in an economy relative to the prices in a base year.

Real GDP

Adjusted Gross Domestic Product for inflation to reflect the actual value of goods and services produced in a country.

NASA Project

Refers specifically to the various missions and research initiatives undertaken by the National Aeronautics and Space Administration (NASA), the United States government agency responsible for the nation's civilian space program and for aeronautics and aerospace research.

GDP

The entirety of the market or monetary valuation of completed goods and services that have been produced within a country's frontiers in a specific time frame is referred to as Gross Domestic Product.