# Algebra

The five fastest roller coasters in the world Fujiyama(Japan), Goliath(CA), Millenium Force(OH), Steel Dragon 2000(Japan), and Superman the Escape(CA). The speeds, in mph, of the first four coasters are 83,85,92,and 95, respectively. How fast can Superman the Escape travel if the average speed of all five coasters is no more than 91 mph?

A)no more than 100 mph
C)at least 100 mph

I think it's A b/c 83+85+92+95+100/5 = 91 mph. it cant be C b/c it says "at least" 100 which means it can go faster than 100 so the answer is A.

1. 👍
2. 👎
3. 👁
1. 5*91>(84+85+92+95+S)

455>356+S
99>S

So the answer is in the above: Superman cannot be going 99 or faster.

check my thinking.

1. 👍
2. 👎
👤
bobpursley
2. if the average speed of ALL 5 coasters is no more than 91 mph then that last coaster has to be 100 mph to reach a speed of 91 on average. if superman goes at 99 then the average would be only 90.8

1. 👍
2. 👎
3. if it's at 100, the average would be 91 exactly

1. 👍
2. 👎

## Similar Questions

1. ### Social Studies

1. What strategy did the Allies agree upon in order to win WWII? A. move to Germany from all sides, then attack Japan by going through the Soviet Union B. defeat Germany and Italy first, then combine forces against Japan*** C.

2. ### Social Studies

hi i need help checking my answer How did early contact with China affect Japan? A. The Japanese government became a model for China. B. Japan became a Chinese territory. C. The Japanese adopted the Chinese writing system. D. The

3. ### History

What caused the United States to enter World War II on the side of the allies? A. Germany’s attack on Britain B. Japan’s attack on the pearl harbor Hawaii 👈This one C.Germany’s invasion in Poland Germany’s invasion in

4. ### Social Studies

Why was the Battle of Midway a turning point in World War II? A. It forced Japan to surrender. B. It represented the last major Axis victory. C. It was the first major defeat for Japan in the Pacific. D. It brought the United

1. ### history

Why did the United States and other countries enforce a ban on the export of iron, steel, and fuel to Japan in the 1930s? Japan pursued an aggressive military policy at the time it invaded China. Japan wanted to become the most

2. ### Social Studies

Why do most Japanese people live near the coastlines? Select all that apply. A. The mountainous terrain makes farming difficult B. Volcanic eruptions make most of Japan unlivable C. Coastal locations are easier to defend from

3. ### History

Which describes the United States efforts to rebuild Japan after World War II? It was a three-phase operation to end Japanese military rule and rebuild Japan’s economy. It was an attempt by the United States to punish Japan for

4. ### history

Which accurately describes similarities between feudal Europe and Japan? (Select all that apply.) the peasants in both Europe and japan received goods instead of money for their work efforts the warrior class in both Europe and

1. ### History

Which explains the decline of Japan’s isolationism? a.The elimination of isolationist policies in Japan was caused by the need to raise money through tariffs on imports. b,Limited natural resources on the islands of Japan led to

2. ### history

Why was military leadership allowed to take control of Japan after World War I A) Japan wanted to continue fighting the war to gain additional land. B) Japan feared communism and vowed to keep it out of the country. C) Military

3. ### history

Which explains the decline of Japan’s isolationism? Limited natural resources on the islands of Japan led to the end of isolationism and allowed for the rise of Japanese industrialization. The elimination of isolationist

4. ### Physics

This speed is the maximum possible speed attained by the roller coaster, or the “theoretical speed”. Roller coasters are carefully designed to minimize frictional forces so that they approach these theoretical speeds. The