Problem
A group of 9 friends invest equally in a business opportunity that costs $20,000. If n more friends were to take part evenly in the investment...
|
So What?
Math questions involving two equations and two unknowns can usually be combined into one equation with one unknown.
Petersons.com
|
Add SAT* Tip of the Day to your personalized My Yahoo! page:
About My Yahoo! and RSS »
|
|
|
ACT: Science Question #6 |
|
Passage 2
During incubation, a bird embryo, like a mammal embryo, uses oxygen to satisfy its energy needs. However, unlike a mammal embryo, a bird embryo cannot rely on its mother to supply the necessary oxygen. The oxygen must be supplied directly from the outside environment by diffusion through pores in the egg's shell. Diffusion is the movement of substances through a membrane from a region of higher concentration to a region of lower concentration.
Based on this fact, a group of scientists suspected that there might be a relationship between the mass of an egg and its total pore area. A pore is a channel through which substances can diffuse from one side of the membrane to the other.
To investigate this concept, the scientists collected the data shown in the table in Table 1.
Question:
Assuming a species of bird has an average egg mass of 500 g, what would be the predicted pore area of its eggs?
Choices:
The correct answer is B.
Choice (B) is correct. 500 g would place this egg between the goose (250g
and 15 mm 2) and the emu (800g and 55 mm 2). The only choice between 15 mm 2
and 55 mm 2 is (B), 40 mm 2, so (B) is correct.
|
|
|
