Find the number of different ways that 2 out of 12 students can volunteer to organize a class party.

A frequency table for the heights of a basketball squad is given alongside.

$$\begin{matrix} \text{Height (cm)} & \text{Frequency}\\ {170 \leqslant H<175} & \text{1}\\ {175 \leqslant H<180} & \text{8}\\ {180 \leqslant H<185} & \text{9}\\ {185 \leqslant H<190} & \text{11}\\ {190 \leqslant H<195} & \text{9}\\ {195 \leqslant H<200} & \text{3}\\ {200 \leqslant H<205} & \text{3}\\ \end{matrix}$$

Explain why 'height' is a continuous variable.

Ammonia gas and water react to form household ammonia, which contains $\mathrm{NH}_{4}^{+}$ and $OH^-$ ions. The formula for water is $H_2O,$ what is the formula for ammonia gas?

Insert either a < or a > symbol to make a true statement.

$$1 . \overline { 1875 }$$

__

$$\frac { 19 } { 16 }$$

Find the derivatives. Assume that a, b, and c are constants. $y = \left( \frac { x ^ { 2 } + 2 } { 3 } \right) ^ { 2 }$

A light ray strikes a mirror at an angle of $42^\circ$ from the surface of the mirror. What angle does the reflected ray make with the normal?

Then _____ carry deoxygenated blood back to the heart.

What occurs when the critical angle is exceeded?

With a classmate, role-play a conversation between the narrator's mother and Auntie Lindo, in which the narrator's mother describes her daughter's talent-show performance.

Ahmad must decide between two publishers who are vying for his new book. Publisher A offers royalties of 1% of net proceeds on the first 30,000 copies and 3.5% on all copies in excess of that figure, and expects to net $2 on each copy sold. Publisher B will pay no royalties on the first 4,000 copies sold but will pay 2% on the net proceeds of all copies sold in excess of 4,000 copies, and expects to net$3 on each copy sold. Suppose Ahmad expects to sell N copies. State a simple criterion based on N for deciding how to choose between the publishers.

What does the polka (sources 3 and 4) reveal about changing cultural practices among the social elite?

What distinguishes single, double, and triple covalent bonds?

How would you say 'he/she knew (saber)' in Spanish?

If $f : x \mapsto \ln x$ and $g : x \longmapsto 3+x$ find: a. $f^{-1}(2) \times g^{-1}(2)$ b. $(f \circ g)^{-1}(2).$