Answer:
Correct answer is B
. They pioneered the study of algebra.
Explanation:
A is not correct as this concept existed even in Ancient Mesopotamia.
Option B is correct as Arabic mathematicians, especially Muhammad ibn Musa al-Khwarizmi contributed the most to the development of algebra.
C is not correct as Euclid lived in Ancient Greece.
D is also not correct as Arabic numerals are also their important contribution.
Answer:William H. steward was appointed to be the secretary of state by president Abraham Lincoln in 1861 and served up to march 1869. He was crucial as he managed international affairs during the civil war and also negotiated the 1861 purchase of Alaska. In addition he was also an antislavery activist in the whig and republican parties before the civil war. He aided US expansion by signing a treaty with Russia to buy Alaska.
There were no more disputes over the balance of slave and free states at that time.
Weird worded question though so it might be wrong. <span />
