If the square root of t is a real number, is the square root of t positive?

(1) t＞0

(2) t2＞0

Over a holiday weekend, a certain car dealer sold off 4 of the cars on its lot. If the cars sold for an average of $6,000 each, how many cars were on the dealer's lot at the beginning of the weekend?

(1) The average value of the remaining cars on the lot is $5,000.

(2) The car dealer made $48,000 in car sales over the weekend.

If the ratio of brown cars to blue cars in a certain parking lot is 2:3, how many brown cars are in the lot?

(1) There are 15 blue cars in the lot.

(2) There are 25 cars total in the lot.