The history of standard oil is an example of which of the following?

The company’s origins date to 1863, when Rockefeller joined Maurice B. Clark and Samuel Andrews in a Cleveland, Ohio, oil-refining business; in 1865 Rockefeller bought out Clark, and two years later he invited Henry M. Flagler to join as a partner in the venture. By 1870 the firm of Rockefeller, Andrews, and Flagler was operating the largest refineries in Cleveland, and these and related facilities became the property of the new Standard Oil Company, incorporated in Ohio in 1870. By 1880, through elimination of competitors, mergers with other firms, and use of favourable railroad rebates, it controlled the refining of 90 to 95 percent of all oil produced in the United States.

hope this helps :)..

angle a = 40.6°

step-by-step explanation:

for any right angle triangle we know the pythagoras theorem reveals

hypotenuse² = height²+base²

by this formula we will calculate the length of hypotenuse

h² = 6²+7²

⇒ h =√36+49 = √85 = 9.22

now from the given triangle sin a = height/ hypotenuse

                                                sin a = 6/9.22 = 0.651

therefore

so angle a = 40.6°

doesn't make any since

explanation: