The cold war officially came to an end in the year a. 1987 b. 1988 c. 1989 d. 1990

Explanation:

On 3 December 1989 the Cold War ‘officially’ ended when Soviet leader Mikhail Gorbachev met with US president George Bush aboard a Soviet ship docked at Malta’s Marsaxlokk harbour.

The summit and joint press conference had the appearance of a friendly, diplomatic conclusion to a protracted conflict spanning four decades, nine American presidents, wars in Vietnam, Korea, Afghanistan, the Cuban Missile Crisis and the Berlin blockade.

for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation:

during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.