1.
A temperatura está em -7ºC e cai mais 4ºC. Para quanto foi a temperatura?
Correct Answer
D. -11ºC
Explanation
The initial temperature is -7ºC and it decreases by 4ºC. To find the final temperature, we subtract 4 from -7, resulting in -11ºC.
2.
Resolvendo a expressão: (-8) + (-4) - (-3) + (-12) obtemos:
Correct Answer
E. -21
Explanation
When solving the expression (-8) + (-4) - (-3) + (-12), we start by simplifying the double negative (-8) + (-4) + 3 + (-12), which gives us -8 - 4 + 3 - 12. Then, we combine like terms to get -12 - 9, which equals -21.
3.
Um submarino está a 150m de profundidade. Ele sobe 100m depois mais 33 metros e depois desce 16 metros. Como podemos indicar a sua posição em relação ao nível do mar?
Correct Answer
C. -33m
Explanation
The submarine starts at a depth of 150m and then rises 100m, bringing it to a depth of 50m. It then rises an additional 33m, bringing it to a depth of 17m. Finally, it descends 16m, bringing it to a depth of -33m. This negative value indicates that the submarine is now 33m above sea level.
4.
Resolvendo a expressão (-8) + (-5) - (-12 + 8) + (-10)
Correct Answer
A. -19
Explanation
The expression can be simplified by following the order of operations (PEMDAS/BODMAS). First, we solve the parentheses: (-12 + 8) equals -4. Then, we add the negative signs before each number: (-8) + (-5) - (-4) + (-10). Combining like terms, we have -8 - 5 + 4 - 10, which equals -19.
5.
Qual será o resultado das seguintes multiplicações:(-5) . (-5) e (10) . (-2) (Lembre-se: Na MULTIPLICAÇÃO dois sinais iguais resulta (+) e dois sinais opostos resulta (-)
Correct Answer
C. 25 e -20
Explanation
The given question asks for the result of two multiplications. In the first multiplication, (-5) multiplied by (-5), two negative signs are being multiplied, which results in a positive sign. Therefore, the result is 25. In the second multiplication, (10) multiplied by (-2), there are two signs that are opposite to each other, which results in a negative sign. Therefore, the result is -20.
6.
Efetuando a divisão (+42) : (-6) obtemos:
Correct Answer
B. -7
Explanation
When dividing a positive number (+42) by a negative number (-6), the result will be a negative number. In this case, the division of 42 by 6 is 7, and since the divisor is negative, the quotient will also be negative. Therefore, the correct answer is -7.
7.
Resolva: -12 + 10 + 8 - 20 - 16 + 5
Correct Answer
A. -25
Explanation
To solve the given expression, we can combine the positive and negative numbers together. Starting with the negative numbers, we have -12, -20, and -16. When we add them together, we get -48. Now, let's add the positive numbers: 10, 8, and 5. Adding them gives us 23. Finally, we can subtract 48 from 23, which gives us -25. Therefore, the correct answer is -25.
8.
Um clube tem saldo de gols igual a -7. Durante um campeonato ele perde uma partida por 1x0 e ganha outra por 4x1. Qual será o seu saldo de gols?
Correct Answer
C. -5
Explanation
The club initially has a goal difference of -7. In the first match, they lose by a score of 1-0, which further decreases their goal difference to -8. However, in the second match, they win by a score of 4-1, which increases their goal difference by 5. Therefore, the final goal difference is -8 + 5 = -3.