-1.8- 3.9 =
(1 point)
0-2.1
05.7
02.1
0-5.7
To calculate -1.8 - 3.9, you sum the two numbers:
-1.8
-3.9
_____
-5.7
So the answer is 0-5.7.
-7 + 5=
(1 point)
0-2
• 12
0-12
02
To calculate -7 + 5, you combine the two numbers:
-7
+5
_____
-2
So the answer is 0-2.
-6.1 + 1.7=
(1 point)
07.8
O-4.4
0-7.8
04.4
To calculate -6.1 + 1.7, you combine the two numbers keeping in mind that one is negative and one is positive:
-6.1
+1.7
_____
-4.4
The correct answer is 0-4.4.
A mountain climber
ascends a mountain to its peak. The peak is 12,740 ft above sea level. The climber then descends 200 ft to meet a fellow climber.
Find the climber's elevation above sea level after meeting the other climber.
(1 point)
• 12,540 ft above sea
level
• 12,540 ft below sea level
• 10,740 ft above sea
level
12,940 ft above sea level
To find the climber's elevation after descending 200 ft, subtract 200 ft from the peak elevation:
12,740 ft (elevation of the peak)
- 200 ft (the descent)
_______________
12,540 ft (elevation after descent)
The climber's elevation above sea level after meeting the other climber is 12,540 ft above sea level.
The correct answer is:
• 12,540 ft above sea level