Lv 2357 points

# Haylee

• ### Determine the intervals?

Determine the intervals on which the following function is concave up or concave down. Identify any inflection points.

​f(x)=e^(−x2/18)

• ### Math word problem?

A hot air ballon is released at 1:00 pm and rises vertically at a rate of 2 meter per second. An observation point is situated 100 meters from a point on the ground directly below the ballon. If it denotes the time in seconds after 1:00pm, find the function that expresses the distance "d" between the ballon and the observation point as a function of "t"?

• ### Math word problem?

A motorboat heads upstream on a river that has a current of 3 miles per hour. The trip upstream takes 5 hours and the return trip takes 2.5 hours. What is the speed of the motorboat in still water (the speed of the boat independent of the current)?

• ### Math Word Problem?

A rectangular swimming pool measures 10 meters by 20 meters is surrounded by a deck of constant width. If the area of the rectangle formed by the pool with its deck measures 600 square meters, what is the width of the deck?

• ### Why does Illinois have more nuclear reactors than any other state?

5 AnswersEarth Sciences & Geology7 years ago
• ### Why does Illinois have more nuclear reactors than any other state?

Just a simple answer Is fine.

1 AnswerEarth Sciences & Geology7 years ago
• ### need help with ideas for a Project Final?

need help with ideas for a Project Final?

So I can either pick a digestive or respiratory system as my focus and im supposed to create a diagram for some aspect of that system. The picture has to late enough to hang in a class room.......any ideas on what I should make?? But I don't want it to take long to make because its due Wednesday

How has the large number of american tourist traveling all over the globe help spread English as a Lingua-Franca?

In 1990 the cost of a postage stamp was 25 cents. In 2010 the cost of a postage stamp was 44 cents. In 20 years, what will the percent of increase in the cost of postage stamps?

• ### What are some common effects risks or dangers of the drug PCP?

No Videos pls! and that means you chelle :\

1 AnswerOther - Health8 years ago
• ### What are some common effects risks or dangers of the drug PCP?

1 AnswerOther - Health8 years ago
• ### What are some common effects risks or dangers of the drug PCP?

1 AnswerOther - Health8 years ago