Correctly use each set of words in a sentence. spongy mesophyll, palisade mesophyll

In each part, sketch on a coordinate line all values of $x$ that satisfy the stated condition.

$$\begin{array} { l l } { \text { (a) } x \leq 4 } & { \text { (b) } x \geq - 3 } & { \text { (c) } - 1 \leq x \leq 7 } \\ { \text { (d) } x ^ { 2 } = 9 } & { \text { (e) } x ^ { 2 } \leq 9 } & { \text { (f) } x ^ { 2 } \geq 9 } \end{array}$$

Let

$$\mathbf { r } = \langle x , y \rangle$$

and

$$\mathbf { r } _ { 0 } = \left\langle x _ { 0 } , y _ { 0 } \right\rangle$$

. In each part, describe the set of all points (x, y) in 2-space that satisfy the stated condition.

$$\left\| \mathbf { r } - \mathbf { r } _ { 0 } \right\| >1$$

When an object is located $38 \mathrm{~cm}$ to the left of a lens, the image is formed $22 \mathrm{~cm}$ to the right of the lens. What is the focal length of the lens?

Combine thin lens equations to show that the magnification for a thin lens is determined by its focal length and the object distance and is given by $m=f /\left(f-d_{\mathrm{o}}\right).$

Describe the shape of a converging lens as compared to the shape of a diverging lens.

If a $=\left\langle a_1, a_2\right\rangle, b=\left\langle b_1, b_2\right\rangle, \mathrm{c}=\left\langle c_1, c_2\right\rangle$, and $m$ and $\boldsymbol{n}$ are real numbers, prove the stated property.

$$\quad 1 \mathbf{a}=\mathbf{a}$$

The QRS complex of the ECG is produced when the (a) atria depolarize. (b) ventricles depolarize. (c) ventricles repolarize. (d) atria repolarize.

Find a polar equation for the conic that has its focus at the pole and satisfies the stated conditions. Points are in polar coordinates and directrices in rectangular coordinates for simplicity. (In some cases there may be more than one conic that satisfies the conditions.)

Ellipse; vertices $(6,0)$ and $(4, \pi)$.

If a $=\left\langle a_1, a_2\right\rangle, b=\left\langle b_1, b_2\right\rangle, \mathrm{c}=\left\langle c_1, c_2\right\rangle$, and $m$ and $\boldsymbol{n}$ are real numbers, prove the stated property.

$$(m+n) \mathbf{a}=m \mathbf{a}+n \mathbf{a}$$