Determine whether the statement is always, sometimes, or never true.

A square root function has two $x$-intercepts.

A barometer reads $1.12\mathrm{~atm}$. Calculate the corresponding pressure in (a) $\mathrm{torr}$ and (b) $\mathrm{mm}\mathrm{~Hg}$.

For the following exercises, graph the absolute value function. Plot at least five points by hand for each graph. $y=|x-1|$

Write as a fraction in simplest form. 25%

What are helicases and topoisomerases?

Refer to $\triangle Q R S$ with vertices $Q(-6,0), R(12,0)$, and $\mathbf{S}(\mathbf{0}, \mathbf{1 2})$.

Show that the three medians meet in a point $G$ (called the centroid). (Hint: Solve two equations simultaneously and show that their solution satisfies the third equation.)

Explain why an iterator is fail-fast

Use a calculator to evaluate each trigonometric ratio, rounded to four decimal places. a) csc $35^{\circ}$ b) sec $216^{\circ}$ c) cot $25^{\circ}$ d) csc $122^{\circ}$ e) sec $142^{\circ}$ f) cot $223^{\circ}$ g) csc $321^{\circ}$ h) sec $355^{\circ}$

Determine the dimensions of Nul A and Col A for the matrices.

$$A=\left[\begin{array}{rrr}1 & 4 & -1 \\ 0 & 7 & 0 \\ 0 & 0 & 0\end{array}\right]$$

Find the dimensions of each matrix.

$$\left[\begin{array}{rrrr} 11 & -8 & 3 & 5 \\ \frac{1}{2} & 0 & 0 & 7 \\ -8 & 0 & 0 & 0 \end{array}\right]$$

Use the given information to find the exact value of each expression: a. $\tan 2 \theta$ b. $\tan \frac{\theta}{2}$

Given: $\cos \theta=\frac{3}{5}, \frac{3 \pi}{2}<\theta<2 \pi$

Two cars start from rest and travel a distance $d$ with constant acceleration. The acceleration of car B is four times that of car A. After each has travelled distance $d$. (a) car $\mathrm{B}$ is moving 16 times as fast as car $\mathrm{A}$. (b) car $\mathrm{B}$ is moving 8 times as fast as car $\mathrm{A}$. $(c)$ car $\mathrm{B}$ is moving 4 times as fast as car $\mathrm{A}$. $(d)$ car $\mathrm{B}$ is moving 2 times as fast as car $\mathrm{A}$.

Los fenomenos naturales. Contesta sobre los fenomenos naturales. 1.¿Cuales son las ventajas y desventajas de desarrollar soluciones tecnologicas para los problemas ambientales a los que nos enfrentamos? 2.¿Cuales son los fenomenos naturales que no debemos intentar controlar? 3.¿Cuales fenomenos naturales que no debemos intentar controlar? 4..¿ Como podemos reducir nuestro impacto negativo sobre el mediambiente? 5-¿Crees que la tecnologia podra mejorar nuestro equilibrio con la naturaleza? Explica.

Las siguientes oraciones usan la voz pasiva con ser. Vuelve a escribirlas usando la pasiva con se.

MODELO Los bosques fueron protegidos del desarrollo urbano.

Escribes Se protegieron los bosques del desarrollo urbano.

La solución fue encontrada fácilmente mediante el intercambio de opiniones.