1. Antônio e Marcos estavam tentando montar um grande quebra-cabeça. Antônio montou 2/5 das peças, e Marcos montou 1/3. Que fração das peças do quebra-cabeça eles montaram juntos? * 1 ponto a) 3/8 b) 11/15 c) 4/15 d) 2/15 2. Na festa de aniversário de Camila, 1/3 dos convidados eram primos, 2/7 eram tios, 1/21 eram avós e o restante eram amigos. A alternativa que contém a fração que corresponde à família de Camila (primos, tios e avós) e a fração correspondente aos convidados que são apenas amigos de Camila, respectivamente é: * 1 ponto a) 1/9 e 2/9 b) 4/31 e 27/31 c) 2/3 e 1/3 d) 19/21 e 2/21

your answer is 228

step-by-step explanation:

add the top and bottom bases together, then divide them by 2, then multiply by the height.

no idea

step-by-step explanation:

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation:

step-by-step explanation: given equation a = h(b 1+b 2)

also we are given values of a, h and b 1 as :

a = 16, h = 4, and b 1 = 3.

in order to solve it for b 2, we need to plug the given values of   a, h and b 1 .

therefore, plugging values of   a, h and b 1   in given equation, we get

16 = 4( 3 + b 2)

first dividing both sides by 4, we get

4 = 3 + b 2

subtracting 3 from both sides, we get

4 -3 = 3 -3 + b 2

1 = b 2.