Crops can be traded on the futures market before they are harvested. If a poor corn harvest is predicted, prices of corn futures rise；if a bountiful corn harvest is predicted, prices of corn futures fall. This morning meteorologists are predicting much-needed rain for the corn-growing region starting tomorrow. Therefore, since adequate moisture is essential for the current crop's survival, prices of corn futures will fall sharply today.

Which of the following, if true, most weakens the argument above?

What is the remainder when 3²⁴³ is divided by 5?

When positive integer N is divided by 7, the remainder is x, and when positive integer M is divided by 11, the remainder is y. What is the greatest value for x + y?

Of 2,500 people who survived a first heart attack, those who did not smoke had their first heart attack at a median age of 62. However, of those 2,500, people who smoked two packs of cigarettes a day had their first heart attack at a median age of 51. On the basis of this information, it can be concluded that nonsmokers tend to have a first heart attack eleven years later than do people who smoke two packs of cigarettes a day.

The conclusion is incorrectly drawn from the information given because this information does not include

After recent hurricanes produced tremendous damage there, Mardin County revised its building code. In doing so, Mardin imposed stricter standards for roofing but not for windows. The revision will undoubtedly reduce the principal cause of property damage, namely rainwater coming through damaged roofs. However,   the revision will do little to prevent personal injuries  , since, while  many injuries are caused by flying debris breaking through windows, very few are caused by roof collapse or rainwater.

Which of the following, if true, most seriously weakens the argument?

If , where and x = 5 – T, which of the following expresses y in terms of N and T ?

The chart above provides a breakdown of car transactions for a local dealership. Were more cars leased in 1999 than were purchased in 1999?

(1) A total of 230 cars were purchased, and there were 10 fewer lease transactions in 2002 than in 1999.

(2) 40 cars were purchased in 2002.

The sequence x₁,x₂... x_n is such that x₁ = 5,x₂ = -5, x₃ = 0, x₄ = -2, x₅ = 4 and x_n=x_n−5* P = ?

(1) Sum of the first P terms in the given sequence is 10

(2) Sum of the first P+3 terms in the given sequence is 10

As the Internet becomes increasingly integrated into business communications, there will be less need for business travel. However, business travelers are a major source of profit for airlines. Therefore, airlines will probably be less profitable in the years to come.

The argument depends on which of the following assumptions?

Hoses A, B, and C pump a swimming pool full of water. Hoses A and B working simultaneously can pump the pool full of water in 4 hours, and Pumps B and C working simultaneously can pump the pool full of water in 6 hours. How long does it take pump A working alone to fill the pool?

(1) All three hoses working simultaneously can fill the pool in 3 hours and 36 minutes.

(2) Hose A and Hose C working simultaneously can fill the swimming pool in twice the time it would take all three hoses together to fill the swimming pool.