1. Temperature difference between peak and foot =5-(- 1)=6℃

100:0.8=h:6。

H = 600/0.8 = 750(m)- answer 1.

2.1300 * 55 = 7150,000 copies. -Answer 2.

3.∠BAC = 90+20+ 10 = 120-a3。

4. After a moves to the right by 6 unit lengths, the coordinates of each point on the number axis are a' (3,0);

B After moving 2 length units to the right, the coordinates of each point on the number axis are b' (-2,0).

At this time, |AB|=3-(-2)=5 (length unit). -Answer 4.