Look at the following statement:
numbers = [10, 20, 30, 40, 50]
a. How many elements does the list have?
b. What is the index of the first element in the list?
c. What is the index of the last element in the list?

The index of refraction is always larger than or equal to 1, but why is that?

Simplify by reducing the index of the radical.

$$\sqrt[9]{x^6 y^3}$$

The exercise deal with the Shannon index of diversity. Note that in two communities with the same number of species, a larger index indicates greater diversity.

A study of barn owl prey in a particular area produced the following data:

Find the index of diversity of this community. Is this community more or less diverse than the one in the previous exercise?

How do negative signs on residuals affect the sum of squared residuals?

Use a graphing utility to approximate (rounded to two decimal places) the local maximum value and local minimum value of $f(x)=x^{3}-2 x^{2}-4 x+5,$ for -3 < x < 3.

A dart board is made of three concentric circles of radius 2, 4, 6 units. A dart thrown at the dart board lands in a random spot on the board. What is the probability that it lands in the bull's-eye?

The windchill index (revised in 2001) for a temperature of 32 degrees Fahrenheit and wind speed x miles per hour is $W(x)=55.628-22.07 x^{0.16}$. a. Graph the windchill index on a graphing calculator using the window [0, 50] by [0, 40]. Then find the windchill index for wind speeds of x = 15 and x = 30 mph. b. Notice from your graph that the windchill index has first derivative negative and second derivative positive. What does this mean about how successive 1-mph increases in wind speed affect the windchill index? c. Verify your answer to part (b) by defining y2 to be the derivative of $y_1$ (using NDERIV), evaluating it at x = 15 and x = 30, and interpreting your answers.

Identify and describe two muscle tissues.

Evaluate each expression. a. 2^4 b. 5^3 c. 8.3^2 d. 1^9 e. 13^1 f. 56.8^0 g. 10^5 h. 100^2 i. 0^12 j. eleven squared k. one and three-tenths cubed l. seven squared times two cubed m. three to the fifth power n. four squared cubed

If you left a board lying on the grass for a few days, what would happen to the grass underneath the board? Why?

In the radical expression $\sqrt[5]{125}$ what is the index? What is the radicand?

Infection that weakens the heart muscle is called _______.

Major home appliances purchased in the United States are now labeled with bright yellow "Energy Guide" tags showing anticipated energy consumption. The tag on a recently purchased washing machine indicated the anticipated energy use would be $940 \mathrm{~kW}$-h per year. Calculate the anticipated annual energy use in kilojoules. (See Question 8 for a definition of a kilowatt-hour.) At 8 cents/ kW-hr, how much would it cost per month to operate this machine?