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David Spice

Numerade Educator

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Educator Statistics

Numerade tutor for 4 years
20 Students Helped

Topics Covered

Differential Equations Made Simple: Expert Tips & Resources

David's Textbook Answer Videos

1

David's Quick Ask Videos

01:55
Geometry

In each set of statements, name the two that contradict each other.
$\angle Y$ is supplementary to $\angle Z$ $\mathrm{m} \angle Y<90^{\circ}$
$\angle Y$ is an obtuse angle.
09:38
Precalculus

Solve the triangle, if possible.
$$A=126.5^{\circ}, a=17.2, c=13.5$$
01:55
Geometry

Show that two lines with equal slopes and different $y$ -intercepts have no point in common. Hint: Let $y_{1}=m x+b_{1}$ and $y_{2}=m x+b_{2}$ with $b_{1} \neq b_{2} .$ What equation must be true for there to be a point of intersection? Show that this leads to a contradiction.
05:37
Calculus 1 / AB

The table shows the population of Nepal (in millions) as of June 30 of the given year. Use a linear approximation to estimate the population at midyear in $1989 .$ Use another linear approximation to predict the population in 2010 .
$$\begin{array}{|c|c|c|c|c|c|}
\hline i & 1985 & 1990 & 1995 & 2000 & 2005 \\
\hline N(i) & 17.04 & 19.33 & 21.91 & 24.70 & 27.68 \\
\hline
\end{array}$$
07:25
Calculus 1 / AB

Draw the appropriate figures. Set up systems of equations and solve them graphically.
Assume Earth is a sphere, with $x^{2}+y^{2}=41$ as the equation of a circumference (distance in thousands of $\mathrm{km}$ ). If a meteorite approaching Earth has a path described as $y^{2}=20 x+140,$ will the meteorite strike Earth? If so, where?
03:28
Calculus 1 / AB

Joey, the mountain climber, is hiking up a mountain with a slope of 2/3. Using his altimeter, he finds that he is gaining altitude at a rate of 6000 feet/hour. How fast is he hiking?
a. 9000 feet/hr
b. 10817 feet/hr
c. 7211 feet/hr
d. None of the above
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