Are You Smarter Than A Seventh Grader ?

The given equations are x + y = 18 and y = 10. To solve for x, we substitute the value of y into the first equation: x + 10 = 18. By subtracting 10 from both sides, we get x = 8. Therefore, the value of x is 8.

The correct answer is "A war in the U.S. - South vs. North, 1800s". The Civil War refers to the conflict that took place in the United States between 1861 and 1865. It was fought primarily between the Southern states, known as the Confederate States of America, and the Northern states, known as the Union. The main cause of the war was the disagreement over slavery and the rights of states. The war resulted in the abolition of slavery and a significant impact on the development of the United States as a nation.

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Turkey is the country that is located in both Asia and Europe. It is a transcontinental country, with a small portion of its landmass in southeastern Europe (known as Eastern Thrace) and the majority of its territory in western Asia (known as Anatolia). The city of Istanbul, formerly known as Byzantium and Constantinople, is one of the most famous examples of a city that spans two continents, as it straddles the Bosporus Strait, connecting Europe and Asia.

The lymphatic system is a network of vessels, nodes, and organs that is responsible for maintaining fluid balance in the body and helping the immune system fight against infections. It transports lymph, a clear fluid containing white blood cells, throughout the body. The lymphatic system plays a vital role in filtering out harmful substances, such as bacteria and viruses, from the body and producing immune cells to defend against them. Therefore, the correct answer is "A system that has something to do with white cells".

Eli Whitney is the correct answer because he is widely recognized as the inventor of the cotton gin. The cotton gin was a revolutionary machine that greatly improved the efficiency of cotton production by separating the cotton fibers from the seeds. Eli Whitney's invention had a significant impact on the cotton industry and played a major role in the expansion of cotton production in the United States during the 19th century.

A vaquero is a term used in Social Studies and Spanish to refer to a cowboy. This term originated in Spain and was later adopted in Latin America and the southwestern United States. Vaqueros were skilled horsemen who herded cattle and worked on ranches. They played a significant role in shaping the cowboy culture and traditions that are associated with the American West.

The two upper chambers in a heart are called atria. The atria receive blood returning to the heart from the body and lungs, and then pump it into the lower chambers of the heart, called ventricles. The term "atria" is derived from the Latin word for "entrance hall," which is fitting because the atria serve as the entrance for blood into the heart.

Santa Anna was a leader in Mexico because he held various positions of power and authority throughout his political career. He served as the President of Mexico multiple times and played a significant role in shaping the country's history. Despite facing both successes and failures, Santa Anna's leadership was characterized by his strong influence and control over the Mexican government and military. His actions and decisions had a profound impact on the nation, making him a prominent figure in Mexican history.