Complete of the following mini-dialogues by writing in the question that was asked.

(a qui / tu) - $\rule{5cm}{1pt}$

• J'ai téléphoné a ma cousine.

Evaluate each expression for the given values of the variables.

$\frac{-x^2}{y^2-x^2}$ for $x=-2$ and $y=3$

If a compressive force of $3.3 \times 10^4 \mathrm{~N}$ is exerted on the end of a $22 \mathrm{~cm}$ long bone of cross-sectional area $3.6 \mathrm{~cm}^2$, $(a)$ will the bone break, and $(b)$ if not, by how much does it shorten?

Luke can swim 25 laps in one hour. Write an algebraic expression to show how many laps Luke can swim in $h$ hours. How many hours will it take Luke to swim 100 laps?

Complete each sentence by writing the form of the verb indicated in parentheses.

The dance troupe ________ the crowd with its performance. (present tense of stun)

Find an equation of the tangent line to the curve at the given point. $y=\ln \left(x^2-3\right), \quad(2,0)$

Determine a rotation $\mathbf{x}=P \mathbf{x}^{\prime}$ that removes the cross-product terms, and give its equation in the $x^{\prime} y^{\prime} z^{\prime}$-system. Name the quadric.

$$2 x^2+3 y^2+23 z^2+72 x z+150=0$$

For this exercise, you will draw a circle and locate the point $\left(\cos 220^{\circ}, \sin 220^{\circ}\right)$ on it.

When writing a function that accepts a two-dimensional array as an argument, which size declarator must you provide in the parameter for the array?

Discuss the role of cholesterol in the formation of atherosclerosis.

The smell of a burning match is due to the formation of sulfur oxides. We can represent the relevant reaction as $\mathrm{S}+\mathrm{O}_2 \rightarrow \mathrm{SO}_2$. If 4.8 g of sulfur is burned in this manner, what mass of sulfur dioxide is produced?

Describe the formation of an aqueous KI solution.

When writing electron confi gurations for elements in period 4, why are electrons placed in the 4s sublevel before the 3d sublevel?

Sodium carbonate, $\mathrm{Na}_2 \mathrm{CO}_3$, is used to manufacture glass. It is obtained from sodium hydrogen carbonate, $\mathrm{NaHCO}_3$, by heating.

$$2 \mathrm{NaHCO}_3(s) \longrightarrow \mathrm{Na}_2 \mathrm{CO}_3(s)+\mathrm{H}_2 \mathrm{O}(\mathrm{g})+\mathrm{CO}_2(\mathrm{~g})$$

Calculate the standard enthalpy of reaction, using enthalpies of formation (Table 6.2).