Tes Operasi Bilangan Bulat

The correct answer is 11 because when you add 13 and -9, you get 4. Then, when you add 4 and 7, you get 11.

The correct answer is -6 because when you subtract 9 from 3, you are essentially moving 9 units to the left on the number line. Starting at 3 and moving 9 units to the left will bring you to -6.

The given expression is -21 + (-28). When adding two negative numbers, we add their absolute values and keep the negative sign. Therefore, the absolute values of -21 and -28 are 21 and 28 respectively. Adding them gives us 49. Since both numbers are negative, the result is -49.

The given expression involves adding three numbers: -15, 13, and -4. When we add -15 and 13, we get -2. Then, when we add -2 and -4, we get -6. Therefore, the correct answer is -6.

The correct answer is 31 because when you subtract a negative number from a positive number, you add the two numbers together. In this case, 18 minus (-13) is the same as 18 plus 13, which equals 31.

The correct answer is -53. To arrive at this answer, we subtract 18 from -35, which gives us -53.

The correct answer is -21. This is because when subtracting a negative number from another negative number, it is equivalent to adding the positive value of that number. Therefore, -12 - 13 + 4 equals -21.

The correct answer is -17. This can be determined by subtracting -28 from -45, which gives us -17.

After the snowfall, the temperature on the mountain peak decreases by 8 degrees Celsius. Since the initial temperature was -6 degrees Celsius, subtracting 8 degrees Celsius from it gives us -14 degrees Celsius. Therefore, the air temperature on the mountain peak after the rain is -14 degrees Celsius.

The temperature inside the refrigerator was initially at -10o C. After a short power outage, the temperature increased to 1o C. Therefore, the temperature change is calculated by subtracting the initial temperature from the final temperature, which is 1o C - (-10o C) = 11o C. Hence, the correct answer is 11 derajat.