Number of Flight Arrivals at Centerville Airport in a Month

On time	Delayed	Total
Airline A Airline B	861 700	2,890 1,850
Total	1,561	4,740

Based on the table above, what fraction of the flights for Airline A were delayed.?

y=x² -6x - 16
The graph of the equation above in the xy-plane is a parabola. Which of the  following equivalent forms of the equation includes the x- and y-coordinates of the  
vertex as constants?

s = 9.8t
The equation above can be used to approximate the speed s, in meters per second  (m/s), of an object t seconds after being dropped into a free fall. Which of the  following is the best interpretation of the number 9.8 in this context?

Note: Figure not drawn to scale.
In the figure above, sin(90° - x⁰) = . What is the value of sin x⁰ ?

The graph above models the speed, s, of an automobile during the first 5 minutes of travel time, t. What was the total distance traveled from t=1 to t=4?

The energy pyramid below shows four trophic levels in an ecosystem and the direction of energy transfer between those levels.

On average, 10% of the net energy of one trophic level is transferred to the next trophic level in an ecosystem. Based on the energy pyramid, if primary producers have 5,000 joules (J) of energy, approximately how much of this energy, in calories, is transferred to the secondary consumers in this ecosystem? (1 calorie= 4.18 J)

Energy flow direction within an ecosystem
1. An ecosystem's energy flow is always unidirectional.
2. It is said to be unidirectional because energy is lost in heat when moving from one trophic level to the next to maintain an organism's homeostasis.
3. As a result, each successive trophic level receives less energy than the previous trophic level.
4. Some energy is lost as heat when an organism moves from one trophic level to the next to maintain homeostasis.
5. As a result, each successive trophic level receives less energy than the previous trophic level.
6. Because the sun is the only energy source for all ecosystems on Earth, the energy flow in the food chain is unidirectional.
7. The energy captured by autotrophs does not return to the sun.
8. As a result, energy flows through various trophic levels in a food chain.
9. Energy comes from the sun and is consumed by producers in most natural ecosystems.
10. It is then passed down through the trophic levels as food.
11. As a result, energy flows from the prey to the predator rather than the other way around.

A sample of 600 ninth graders was selected at random and asked how much time  they spend on homework each day. Of the ninth graders selected, 220 spend less  than 2 hours on homework each day. If the conclusion was drawn that  "approximately 1.35 million ninth graders spend less than 2 hours on homework  each day," which of the following is closest to the population, in millions, of ninth graders?

(2x - 1)(x+ 2)² = 0
What is the solution set to the equation above?

f(x) = x(x + 5)
The function f is defined above. If the function g is defined by g(x) = f(x) + 5, what is  the value of g(3) ?

If 2x+ 3 = x - 4, what is the value of x + 8 ?

Which of the following is a solution to the equation ?
I. -2
II. 1
III. 5

Which of the following equations represents the line in the xy-plane that passes through (0, 3) and has a slope of -3 ?

Which of the following expressions is equivalent to
3q² + r³ + 5r- 8q + 2(q² + r)?

If x + 3 = 2x − 2, what is the value of x − 4 ?

The volume of a neodymium magnet is 2.50 cubic centimeters, and its mass is 18.5 grams. What is the density, in grams per cubic centimeter, of the magnet?

2x(x² + 1) + (2x² − 2x)
Which of the following expressions is equivalent to the expression above?