Gallup found in 2013 that 58% of Americans worry a great deal or a fair amount about global warming, up from 55% in 2012. Results for this Gallup poll were based on telephone interviews performed on March $7-10,2013$, with a random sample of 1022 adults, aged 18 and older, living in the United States. Does the increase from 2012 to 2013 show a substantial increase in concern?

e) Do you think this difference is meaningful? Explain.

A company paid $\$ 326,000$ for property that included land, land improvements, and a building. The land was appraised at $\$ 175,000$, the land improvements were appraised at $\$ 70,000$, and the building was appraised at $\$ 105,000$. What is the allocation of property costs to the three assets purchased?

a. Land, $\$ 150,000$; Land Improvements, $\$ 60,000$; Building, $\$ 90,000$ b. Land, $\$ 163,000$; Land Improvements, $\$ 65,200$; Building, $\$ 97,800$ c. Land, $\$ 150,000$; Land Improvements, $\$ 61,600$; Building, $\$ 92,400$ d. Land, $\$ 159,000$; Land Improvements, $\$ 65,200$; Building, $\$ 95,400$ e. Land, $175,000; Land Improvements, $70,000; Building,$\$105,000$

A $1.912$ -g sample of calcium chloride is decomposed into its constituent elements and found to contain $0.690 \mathrm{~g} \mathrm{Ca}$ and $1.222 \mathrm{~g} \mathrm{Cl}$. Calculate the mass percent composition of $\mathrm{Ca}$ and $\mathrm{Cl}$ in calcium chloride.

Find the possible values of $a$ if the points with the given coordinates are the indicated distance apart.

$$(6,-3),(-3, a) ; d=\sqrt{130}$$

An automobile that sold for $\$ 12,785$ in $1989$ would sell for how much in $2009$? Use the composite CPI in the said figure on page mentioned.

April is usually a good month to purchase home improvement supplies. A sheet of cedar paneling at the lumber company regularly sells for $58.50. Jud Stassi purchases the paneling on sale for$48.95 a sheet. What is the markdown?

Recall that the symbol $\bar{z}$ represents the complex conjugate of $z$. If $z-a+b i$ and $w-c+d i$, prove each statement.

$\bar{z}+\bar{w}=\overline{z+w}$

Find the curvature function $\kappa (x)$ of the curve. Then use a calculator or computer to graph both the curve and its curvature function $\kappa (x)$ on the same set of axes.

$$y=e^{-x^2}$$

Use the Factor Theorem either to factor the polynomial completely or to prove that it has no linear factors with integer coefficients.\

$$2 x^3+5 x^2+x-2$$

For the following exercise,

Use a calculator to solve the equation. Unless indicated otherwise, round all answers to the nearest ten-thousandth.

The magnitude $M$ of an earthquake is represented by the equation $M=\frac{2}{3} \log \left(\frac{E}{E_0}\right)$ where $E$ is the amount of energy released by the earthquake in joules and $E_0=10^{44}$ is the assigned minimal measure released by an earthquake. To the nearest hundredth, what would the magnitude be of an earthquake releasing $1.4 \cdot 10^{13}$ joules of energy?

Consider the flow system sketched in the figure. The fluid is water, and the pump is a centrifugal pump. Obtain a qualitative plot of the pump net head as a function of the pump capacity. On the figure, label the shutoff head, the free delivery, the pump performance curve, the system curve, and the operating point. (Hint: Carefully consider the required net head at conditions of zero flow rate.)

Use the result of the earlier exercise find the curvature of each polar curve.

$$r=1+\sin \theta$$

Add: $\frac{5}{3 a^2 b^3}+\frac{7}{8 a b^4}$

Integrate each of the given functions.

$$\displaystyle\int_0^1 6 \sin \frac{1}{2} t \sec \frac{1}{2} t d t$$