John Johnson

Numerade Educator

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Educator Statistics

Numerade tutor for 4 years
23 Students Helped

Topics Covered

Spectroscopy
Understanding Electromagnetic Waves: A Comprehensive Guide
Differential Equations Made Simple: Expert Tips & Resources
Discover the Fascinating World of Nuclear Physics
Functions
Discover the Best Series to Binge-Watch | Your Ultimate Guide
Mastering Multiple Integrals: Techniques and Tips
Mastering Equations and Inequalities: Your Guide to Mathematical Success

John's Textbook Answer Videos

0:00
Discrete Mathematics with Applications

A third useful quantifier is the uniqueness quantifier $\exists 1 .$ The proposition $\left(\exists^{\prime} x\right) \mathrm{P}(x)$ means There exists a unique (meaning exactly one) $x$ such that $P(x) .$ Determine the truth value of each proposition, where $\mathrm{UD}=$ set of integers.
$$(\forall x)(\exists ! y)(x+y=4)$$

Chapter 1: The Language Of Logic
Section 3: Qualifiers
John Johnson
0:00
Discrete Mathematics with Applications

If $\Sigma$ is a nonempty alphabet, then $\Sigma^{*}$ is infinite. (Hint: Assume $\Sigma^{*}$ is finite. Since $\Sigma \neq \emptyset,$ it contains an element $a$ Let $x \in \Sigma^{*}$ with largest length. Now consider $x a .$ .

Chapter 2: The Language of Sets
Section 1: The Concept of Set
John Johnson
00:02
College Algebra: Real Mathematics, Real People

To work an extended application analyzing the numbers of bachelor's degrees earned by women in the United States from 2001 through 2012, visit this textbook's website at LarsonPrecalculus.com. (Data Source: National Center for Education Statistics)

Chapter 1: Functions and Their Graphs
Section 2: Lines in the Plane
John Johnson
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John's Quick Ask Videos

00:02
Calculus 3

Chronic illness, Part I. In 2013, the Pew Research Foundation reported that "45% or U.S. adults report that they live with one or more chronic conditions". However, this value was based on a sample, so it may not be a perfect estimate for the population parameter of interest on its own. the study reported a standard error of about 1.2%, and a normal model may be reasonably be used in this setting. (The sample size has already been checked, and it is large enough.) Create a 95% confidence interval for the proportion of U.S. adults who live with one or more chronic conditions. (Give your answers as percents rounded to one decimal place.)
Lower limit:
Upper limit:

John Johnson
00:09
Linear Algebra

In Exercises $19-22$ , determine the value(s) of $h$ such that the matrix is the augmented matrix of a consistent linear system.
$$
\left[\begin{array}{lll}{1} & {h} & {4} \\ {3} & {6} & {8}\end{array}\right]
$$

John Johnson
00:07
Calculus 3

The Fashion Store has $6000 available each month for advertising. Newspaper ads cost $200 each and no more than 20 can be run per month. Radio ads cost $100 each and no more than 30 can run per month. TV ads cost $800 each, with a maximum of 77 available each month. Approximately 1000 women will see each newspaper ad, 800 will hear each radio ad, and 15,000 will see each TV ad. How much of each type of advertising should be used if the store wants to maximize exposure? How many newspaper ads should be placed? How many radio ads should be placed? How many TV ads should be placed?

John Johnson
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