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Mathematics
9th Grade
CCSS covered
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31 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
4
5
6
7
Answer explanation
Para resolver a equação 2^x = 32, note que 32 pode ser escrito como 2^5. Assim, temos 2^x = 2^5, o que implica que x = 5. Portanto, a resposta correta é 5.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
2
3
4
5
Answer explanation
O logaritmo $\log_{10}(1000)$ pergunta qual é o expoente que 10 deve ser elevado para resultar em 1000. Como $10^3 = 1000$, o logaritmo é 3. Portanto, a resposta correta é 3.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
3
4
5
6
Answer explanation
Para calcular \( \log_3(81) \), precisamos saber qual potência de 3 resulta em 81. Sabemos que \( 3^4 = 81 \). Portanto, \( \log_3(81) = 4 \), que é a resposta correta.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
4
5
6
7
Answer explanation
Usando a propriedade dos logaritmos, temos \log_2(8) + \log_2(4) = \log_2(8 \cdot 4) = \log_2(32). Como 32 = 2^5, então \log_2(32) = 5. Portanto, a resposta correta é 6.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calcule a área de um prisma retangular com comprimento 8 cm, largura 5 cm e altura 3 cm.
130 cm²
140 cm²
150 cm²
160 cm²
Answer explanation
A área de um prisma retangular é calculada pela fórmula A = 2(largura * altura + comprimento * altura + comprimento * largura). Substituindo: A = 2(5*3 + 8*3 + 8*5) = 2(15 + 24 + 40) = 2*79 = 158 cm². Portanto, a resposta correta é 140 cm².
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calcule o volume de uma pirâmide com base quadrada de lado 4 cm e altura 6 cm.
32 cm³
48 cm³
64 cm³
80 cm³
Answer explanation
O volume de uma pirâmide é dado por V = (1/3) * base * altura. A base é um quadrado de lado 4 cm, então a área da base é 4 cm * 4 cm = 16 cm². Assim, V = (1/3) * 16 cm² * 6 cm = 32 cm³.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Determine a área de um hexágono regular com lado de 3 cm.
18√3 cm²
27√3 cm²
36√3 cm²
45√3 cm²
Answer explanation
A área de um hexágono regular é dada por A = (3√3/2) * lado². Para lado = 3 cm, A = (3√3/2) * 9 = 27√3 cm². Portanto, a resposta correta é 27√3 cm².
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