[求助]4道数学题>o<

1.There are between 100and 110 cards in a collection of cards. If they are counted out 3 at a time, there are 2 left over, but if they are counted out 4 at a time, there is 1 left over. How many cards are in the collection?

A101 B103 C106 D107 E109  (答案A)

2. An instructor scored a student's test of 50 questions by subtracting 2 times the number of incorrect answers from the number of correct answers. If the student answered all of the questions and received a score of 38. how many questions did that student answer correctly?

A19 B38 C41 D44 E46 (答案E)

3. a ladder 25 feet long is leaning against a wall that is perpendicular to level ground. The bottom of the ladder is 7 feet from the base of the wall. If the top of the ladder slips dpwn 4 feet, how many feet will the bottom of the ladder slip?

A4 B5 C8 D9 E15 (答案C)

4.What is the least possible product of 4 different integers , each of which has a value between -5 and 10 , inclusive?

A-5040 B-3600 C-720 D-600 E-120 (答案B)

万分感谢~~~~~~~~~~~~~~~~~~`

3. a ladder 25 feet long is leaning against a wall that is
perpendicular to level ground. The bottom of the ladder is 7 feet from
the base of the wall. If the top of the ladder slips dpwn 4 feet, how
many feet will the bottom of the ladder slip?

A4 B5 C8 D9 E15 (答案B?)

I think the answer is B, 12-7=5

4.What is the least possible product of 4 different integers , each of which has a value between -5 and 10 , inclusive?

A-5040 B-3600 C-720 D-600 E-120 (答案B)

4 number: -5 *10* 9* 8=-3600