What are the advantages of phytoremediation over acid leaching in treating contaminated soils?

Find the angle $\theta$ between the given vectors. $\mathbf{a}=3 \mathbf{i}-\mathbf{k}, \mathbf{b}=2 \mathbf{i}+2 \mathbf{k}$

What is overburden? A spoil bank? Smelting? Tailings?

Look around your home for consumer products with a Household Hazardous Product Symbol warning that the contents are corrosive (a) In which room(s) were most of these products found? (b) Using only the information given on the product label, try to classify these substances as acidic or basic. Caution: Do not open any of these products.

You read a newspaper article that describes a study of whether stress management can help reduce heart attacks. The 107 subjects all had reduced blood flow to the heart and so were at risk of a heart attack. They were assigned at random to three groups. The article goes on to say: One group took a four-month stress management program, another underwent a four-month exercise program, and the third received usual heart care from their personal physicians. In the next three years, only three of the 33 people in the stress management group suffered "cardiac events," defined as a fatal or non-fatal heart attack or a surgical procedure such as a bypass or angioplasty. In the same period, 7 of the 34 people in the exercise group and 12 out of the 40 patients in usual care suffered such events. Use the information in the news article to make a two-way table that describes the study results.

You roll a number cube twice. What is the probability that you roll each pair of numbers? 6, then a number less than 4

Perform the indicated operations. If possible, reduce the answer to its lowest terms.

$$\frac { 13 } { 15 } - \frac { 2 } { 45 }$$

True or False. The only even trigonometric functions are the cosine and secant functions.

A system consisting of 2 kg of water initially at $160^{\circ} \mathrm{C},$ 10 bar undergoes an internally reversible, isothermal expansion during which there is energy transfer by heat into the system of 2700 kJ. Determine the final pressure, in bar, and the work, in kJ.

Simplify. Write the expression using only positive exponents. 26. mˉ² • n³

Use properties of determinants to find the value of each determinant if it is known that

$$\left|\begin{array}{ll}{x} & {y} \\ {a} & {b}\end{array}\right|=8$$

.

$$\left|\begin{array}{ll}{2 x} & {y} \\ {2 a} & {b}\end{array}\right|$$

Let

$$Y _ { 1 } , Y _ { 2 } , \ldots , Y _ { n }$$

be a random sample from a population with density function

$$f ( y | \theta ) = \left\{ \begin{array} { l l } { \frac { 2 \theta ^ { 2 } } { y ^ { 3 } } , } & { \theta < y < \infty } \\ { 0 , } & { \text { elsewhere. } } \end{array} \right.$$

Show that

$$Y _ { ( 1 ) } = \min \left( Y _ { 1 } , Y _ { 2 } , \ldots , Y _ { n } \right)$$

is sufficient for

$$\theta$$

.

Monica paid sales tax of $1.50 when she bought a new bike helmet. If the sales tax rate was 5%, how much did the store charge for the helmet before tax?

Describe how you would solve the equation

$$x ^ { \frac { 2 } { 3 } } = n$$

. How is this solution method to be interpreted if the equation had been written in radical form instead?