Calculate the molar mass of xenon trioxide.

Plain doughnuts from a particular bakery have an average mass of $32.6$ g, whereas jam-filled doughnuts from the same bakery have an average mass of $40.0 \mathrm{~g}$. (a) Determine the mass of a dozen plain doughnuts and the mass of a dozen jam-filled doughnuts. (b) Determine the number of doughnuts in a kilogram of plain and the number in a kilogram of jam-filled. (c) Determine the mass of plain doughnuts that contains the same number of doughnuts as a kilogram of jam-filled. (d) Determine the total mass of a dozen doughnuts consisting of three times as many plain as jam-filled.

How much energy becomes unavailable for work in an isothermal process at 440 K, if the entropy increase is 25 J/K ?

Give an example of a criterion variable.

A real number t is given. Find the reference number for t. $t=\frac{5 \pi}{3}$

Choose the best answer to the following. Explain your reasoning with one or more complete sentences.
Measurements of how orbital speeds depend on distance from the center of our galaxy tell us that stars in the outskirts of the galaxy
(a) orbit the galactic center just as fast as stars closer to the center.
(b) rotate rapidly on their axes.
(c) travel in straight, flat lines rather than elliptical orbits.

Use your result from the previous question to solve each of these for the unknown variable:

a. $log _{11} 11=x$

b. $log _5 p=1$

c. $log _q 3=1$

Use graphical methods to solve the inequality.

$$2 x^2 \leq 5 x+6$$

Solve for the variable indicated. A=½bh for b

In given problem, use the methods of given example to find power series in x for each function f.

$$f(x)=e^x \tan ^{-1} x$$

Solve for the indicated variable. P = a + b + c; b

Refer to Exercise 20.25. Forecast next year’s enrollment using the following methods. Autoregressive forecasting model.

One of the things you were asked to estimate in Lesson 1-4 was the monthly payment on a $\$ 10,000$ car if you wanted to pay it off in 3 years. If the interest rate is $3 \%$, the expression below can be used to calculate the exact monthly payment.

$$\frac{\left(\frac{0.03}{12}\right)(10,000)\left(1+\frac{0.03}{12}\right)^{36}}{\left(1+\frac{0.03}{12}\right)^{36}-1}$$

Clearly, this is a pretty complicated expression that would require some help from a calculator or computer. But you can't get that help unless you understand the order of operations, because calculators and computers are programmed to obey those rules. Spend some time writing this expression the way you'd need to enter it into a calculator or spreadsheet. Use " $\wedge$ " for exponents, " $*$ " for multiplication, and " $/$ " for division.

Which of the following are incorrect and why? See the second Concept Check in this section.

$\frac{7 m-9}{7}$ simplifies to $m-9$ ?