Keystone Quiz Practice Test

By subtracting 3 from both sides, the equation becomes 2x = 8. Dividing both sides by 2 yields x = 4, which is the correct solution.

Mitochondria are responsible for producing energy through cellular respiration, which is why they are referred to as the powerhouse of the cell. This is a fundamental concept in biology at the high school level.

The word 'rapid' means fast or quick. The option 'Quick' correctly matches this meaning while the other options indicate slower or inconsistent actions.

The Constitution is the foundational document that establishes the framework of a government and its principles. It outlines the structure and limits of government power, making it essential for civics studies.

Hyperbole is a figure of speech that uses extreme exaggeration to emphasize a point. It is a common literary device that helps create strong images or impressions, which is why it is the correct answer.

Expanding the equation gives 3x - 6 = 15. Adding 6 to both sides results in 3x = 21, and dividing by 3 yields x = 7, which is the correct answer.

The area of a triangle is calculated with the formula ½ à - base à - height. Substituting the given values results in ½ à - 8 à - 5 = 20 cm².

Irony involves a situation or statement where the outcome is contrary to what was expected, creating a stark contrast. This definition is essential for analyzing literary texts.

Chlorophyll is the pigment that absorbs sunlight, driving the process of photosynthesis in plants. Its role is fundamental in converting light energy into chemical energy.

Mitosis is the process by which a cell divides to form two new cells that are genetically identical to the original cell. This is critical for growth, repair, and asexual reproduction in organisms.

The assassination of Archduke Franz Ferdinand set off a chain reaction of events that eventually led to World War I. This event is widely recognized as a critical turning point in early 20th-century history.

An oligarchy is a form of government in which power resides with a small group of people. This contrasts with systems like democracy where power is more broadly distributed.

Substituting x = 4 into the function gives f(4) = 2(4) + 3 = 11. function evaluation like this is a core concept in algebra.

The exposition of a story provides essential background information, including the setting and characters. This is the stage where readers are introduced to the world of the narrative.

The water cycle is critical for redistributing water across the planet, which supports the survival of all living organisms. Its role in sustaining life and maintaining environmental balance is a key ecological concept.

Let the width be x; then the length is 2x. The perimeter is given by 2(x + 2x) = 6x, and setting 6x equal to 54 cm gives x = 9 cm, so the length is 18 cm. This problem integrates algebra with geometric formulas.

Personification is the technique of giving human traits to nonhuman objects or ideas, enhancing imagery in literary texts. This method is frequently used to create vivid and relatable expressions in literature.

Using the formula v = gt with g approximately 9.8 m/s², an object in free fall for 3 seconds reaches a velocity of 9.8 à - 3 ≈ 29.4 m/s. This calculation is essential for understanding basic principles of physics.

The pH is calculated using the formula pH = -log[H+]. For a hydrogen ion concentration of 1 x 10^-5 M, the pH is 5, indicating a slightly acidic solution. Understanding pH is fundamental in chemistry.

Checks and balances is a system that distributes power among the branches of government so that no single branch can dominate. This principle is fundamental to maintaining a balanced and democratic government.