Whay contribution did al-khwarizmi make to the world of mathematics?

a. he developed the formula and process used to make persian rugs.

b. his work became baisis for algebra.

c. he created the number system based on chinese number system.

d. he determined the formula for finding the hypotenuse of a right triangle.

In shifting to a defense policy based upon the concept of "flexible response," president kennedy was indicating that he had grave doubts about thevalue of which previous defense policy? a massive retaliationb collective securityc containmentd air power

What is the main idea of this excerpt? 1.1.3

Which of the following are details about the compromise of 1877? election results in a couple of states were in dispute and too close to call. samuel tilden would be given the win in exchange for the removal of federal troops. the presidential election was close between rutherford hayes and ulysses grant. it was agreed troops would leave the south in exchange for a hayes victory.