Earth’s geographical poles have not changed their position, because
the North Pole is always at the top of the planet and the South Pole is
always at the bottom. You are told, however, that the magnetic poles
have changed their locations, so they must be at different locations
than the geographic poles, making Choice (C) the correct answer.
The information gives no indication that the core is shifting toward
the surface or that all magnets are made of iron, so you can reject
Choices (A) and (B). Choice (D) can also be eliminated because
there is no reason to believe that compasses will no longer be
affected by the Earth’s magnetic field.

The circulatory system transports nutrients dissolved in the blood to
all the cells of the body, so Choice (C) is correct. The digestive
system is involved in breaking down food into nutrients, so you can
reject Choice (A). The integumentary system is the protective layer
of the body, including the skin, hair, and nails, so Choice (B) is
incorrect. The muscular system is responsible for the movement of
the body itself, so Choice (D) is incorrect.

Plant cells contain organelles called chloroplasts that contain the
chlorophyll needed for photosynthesis. This is how plants produce
their own food. Cell walls [Choice (A)] and vacuoles [Choice (B)]
help support the plant but aren’t involved in photosynthesis. Also,
both plant and animal cells contain mitochondria, so Choice (C) is
incorrect.

Let the original price of the sweater equal x. Because the discount is
20%, that means that the sale price is 80% of the original price.
Hence, $64 = (.080)x.
Solve for x by dividing both sides of the equation by 0.80. Therefore,
x = $80, making Choice (C) the correct answer.

Look at each possible answer separately:
Because w = x , Choice (A) reduces to y > z ; this is untrue, so Choice
(A) is incorrect.
Although Choice (B) may appear correct because y < z, it’s actually
false when w and x are both negative, so Choice (B) is incorrect.
Because w = x, Choice (C) reduces to -y > -z -> y < z; this is true,
making Choice (C) the correct answer.
Because w = x, Choice (D) reduces to 0 < y - z. Adding z to both sides
shows that z < y; this is untrue, so Choice (D) is incorrect.

Set up a proportion for the small triangle that includes the boy’s
height as the numerator and the base as the denominator: height / base = 5 / 8

Substitute the given base of the big triangle into the proportion,
letting x equal the height of the tree: x / 24 = 5 / 8

Multiply both sides by 24 to solve for x: x = 24 ( 5 / 8 ) = 15

According to the except, “The United States of America was
suddenly and deliberately attacked by naval and air forces of the
Empire of Japan” at Pearl Harbor in Hawaii, making Choice (B) the
correct answer. Choice (A) is the opposite of what happened. There
was no ongoing war between Japan and the United States; in fact, the
excerpt mentions that the nations were still negotiating a peace treaty
at the time of the attack, making Choice (C) incorrect. Hawaii is not
part of the continental United States, so Choice (D) is false.

The passage tells you that red blood cells carry oxygen from the
lungs to all the cells of the body, where it is used during cellular
respiration, making Choice (C) the correct answer. Although Choice
(D) is a true statement, it can still be rejected because making the
blood appear red is not the main function of red blood cells.

You’re told that the number of electrons found in the outermost shell
is the number of valence electrons. You’re also told that the first
energy shell holds a maximum of 2 electrons and that the second
energy shell holds a maximum of 8 electrons.
Sodium has 11 electrons in total, so the first 2 go in the first energy
shell and the next 8 go in the second energy shell, leaving 1 valence
electron in the outermost shell. Similarly, fluorine has 9 electrons in
total, so the first 2 go in the first energy shell, leaving 7 valence
electrons in the outermost shell. Therefore, Choice (A) is correct.

Solar eclipses occur when the moon passes between the sun and the
Earth, casting the moon’s shadow on the Earth’s surface, making
Choice A correct.

Choice (B) would never happen because the sun is much farther
away from the Earth than the moon is. Choice (C) is incorrect
because although clouds may partially block the sun’s rays (as on a
cloudy day), they do not cause solar eclipses, which involve the total
blockage of the sun’s rays. Choice (D) would cause a lunar eclipse
(not a solar eclipse) because the Earth would cast its shadow on the
moon’s surface.

Calculate how much Jenny’s salary rose during the past four years as
follows. First find the difference in salary: $32,443 - $22,625 = $9,808

Divide this by 4 to calculate the average rise per year: $9,808 / 4 = $2,452

Multiply this by 5 to calculate her salary increase over the next 5
years: $2,452 x 5 = $12,260

Add this to her current salary: $32,433 + $12,260 = $44,693

First, you need to determine the number of hours that Jim rented the
lawnmower for: There are 3 hours from 9:00 a.m. till noon (12:00
p.m.) and 5.5 hours from noon till 5:30 p.m., for a total of 3 + 5.5 = 8.5
hours. Then you can find the hourly cost by dividing the total cost by
the number of hours: $53.04 / 8.5 = $6.24