Bab 1 Nombor Nisbah (Tingkatan 1)

Explanation
The given expression involves subtraction and addition of negative numbers. When we subtract -4 from 50, we get 54. Then, when we add -80 to 54, we get -26. Therefore, the correct answer is -26.

Explanation
let’s evaluate the expression:
(14×−2)26​×3
First, calculate the value inside the parentheses:
14×−2=−28
So the expression becomes:
−2826​×3
Next, perform the division:
−2826​=−0.9285714285714286
So the expression becomes:
−0.9285714285714286×3
Finally, perform the multiplication:
−0.9285714285714286×3=−2.7857142857142856
So, the value of the expression
(14×−2)26​×3
is approximately -2.79 when rounded to two decimal places.

Explanation
The correct answer is - 12oc. The question states that the temperature of a cup of water decreases by 28oc in 6 minutes. To find the rate of change per minute, we divide the total change in temperature (28oc) by the total time (6 minutes). Therefore, the rate of change per minute is - 12oc.

Explanation
The statement "25 is greater than -12" is false. In reality, -12 is greater than 25.

Explanation
The given expression involves addition and subtraction of negative numbers. When we add -16 and -31, we get -47. Then, when we subtract -47 from 85, we get -132. Therefore, the correct answer is -132.

Explanation
The given sequence is -9, -8, -6, m, 1, 6. To find the value of m, we can observe that the sequence is increasing by 1 each time. Therefore, the value of m should be -6 + 1 = -5. However, since -5 is not an option, we need to look for the next number in the sequence. The next number after -6 is -5, followed by -4. Therefore, the correct answer is -4.

Explanation
The initial temperature of the mixture is 18°C. It is then cooled at a rate of 2.5°C per minute for 12 minutes. This means that the temperature decreases by 2.5°C every minute for 12 minutes. After the cooling process, the temperature of the mixture would be 18 - (2.5 * 12) = 18 - 30 = -12°C. However, temperature cannot be negative, so we can assume that the temperature is 0°C.

Next, the mixture is heated at a rate of 3.2°C per minute for 7 minutes. This means that the temperature increases by 3.2°C every minute for 7 minutes. Therefore, the temperature of the mixture would be 0 + (3.2 * 7) = 0 + 22.4 = 22.4°C.

Therefore, the final temperature of the mixture is 22.4°C, which is not one of the given answer options. Since none of the answer options match the calculated final temperature, the correct answer is not available.

Explanation
Darwin bought 4 T-shirts and 2 pairs of shoes. The price of each T-shirt is RM 35 and each pair of shoes is RM 79. The total cost of the T-shirts is 4 x RM 35 = RM 140 and the total cost of the shoes is 2 x RM 79 = RM 158. The total cost without discount would be RM 140 + RM 158 = RM 298. However, Darwin received a discount of RM 9, so the final amount he paid is RM 298 - RM 9 = RM 289. Therefore, the correct answer is RM 289.

Explanation
The correct answer is -12. The question states that the number of computers sold decreased by 36 in three months. To find the average decrease in sales per month, we divide 36 by 3, which equals 12. Since the decrease is negative (indicating a decrease in sales), the average decrease in sales per month is -12.

Explanation
Ahmad pergi ke sekolah ketika suhu adalah -3⁰C dan pada waktu rehat suhu naik menjadi 5⁰C. Oleh karena itu, suhu meningkat sebesar 8 derajat (5⁰C - (-3⁰C) = 8⁰C).

Explanation
The given matrix represents a portion of a number line. The numbers in the matrix are arranged in a specific pattern. The number in the top left corner is 4, and each subsequent number is obtained by subtracting 3 from the previous number. So, the number in the second row, first column is 1, obtained by subtracting 3 from 4. Similarly, the number in the third row, first column is -8, obtained by subtracting 3 from 1. Finally, the number in the fourth row, first column is -28, obtained by subtracting 3 from -8. Therefore, the sum of the numbers in the second and third rows, first column is 1 + (-8) = -7.

Explanation
The correct answer is 2,300. An integer is a whole number that does not have any fractional or decimal parts. In the given options, only 2,300 is a whole number without any decimals or fractions. Therefore, it is the only integer among the given options.

Explanation
The given expression is - 6 + ( -4 ) + 5. To find an expression with the same value, we need to simplify it. The sum of -6, -4, and 5 is -5. Among the given options, the expression 4 - 8 + ( -1 ) also simplifies to -5. Therefore, it has the same value as the given expression.

Explanation
The correct answer is 140 because the expression follows the order of operations (PEMDAS/BODMAS). First, we perform the multiplication and division from left to right. 18 x 7 = 126 and 126 ÷ 14 = 9. Then, we subtract 9 from 149, giving us 140.