Em uma classe há 9 alunos, dos quais 3 são meninos e 6 são meninas. Os alunos dessa classe deverão formar 3 grupos com 3 integrantes em cada grupo, de modo que em cada um dos grupos haja um menino. O número de maneiras que esses grupos podem ser formados é

A reta s é perpendicular à reta r e delimita, com os eixos coordenados, no primeiro quadrante, um triângulo de área !$ { \large 128 \over3} !$.

O ponto de interseção de r e s tem abscissa

An increasing body of evidence suggests that the time we spend on our smartphones is interfering with our sleep, self-esteem, relationships, memory, attention spans, creativity, productivity and problem-solving and decision-making skills. But there is another reason for us to rethink our relationships with our devices. By chronically raising levels of cortisol, the body’s main stress hormone, our phones may be threatening our health and shortening our lives.

If they happened only occasionally, phone-induced cortisol spikes might not matter. But the average American spends four hours a day staring at their smartphone and keeps it within arm’s reach nearly all the time, according to a tracking app called Moment.

“Your cortisol levels are elevated when your phone is in sight or nearby, or when you hear it or even think you hear it,” says David Greenfield, professor of clinical psychiatry at the University of Connecticut School of Medicine and founder of the Center for Internet and Technology Addiction. “It’s a stress response, and it feels unpleasant, and the body’s natural response is to want to check the phone to make the stress go away.”

But while doing so might soothe you for a second, it probably will make things worse in the long run. Any time you check your phone, you’re likely to find something else stressful waiting for you, leading to another spike in cortisol and another craving to check your phone to make your anxiety go away. This cycle, when continuously reinforced, leads to chronically elevated cortisol levels. And chronically elevated cortisol levels have been tied to an increased risk of serious health problems, including depression, obesity, metabolic syndrome, Type 2 diabetes, fertility issues, high blood pressure, heart attack, dementia and stroke.

(Catherine Price. www.nytimes.com, 24.04.2019. Adaptado.)

No trecho do segundo parágrafo “If they happened only occasionally”, o termo sublinhado refere-se a:

De dentro do ônibus, que ainda fazia manobras para estacionar no ponto de parada, o rapaz, atrasado para o encontro com a namorada, a vê indo embora pela calçada. Quando finalmente o ônibus para e o rapaz desce, a distância que o separa da namorada é de 180 m.

An increasing body of evidence suggests that the time we spend on our smartphones is interfering with our sleep, self-esteem, relationships, memory, attention spans, creativity, productivity and problem-solving and decision-making skills. But there is another reason for us to rethink our relationships with our devices. By chronically raising levels of cortisol, the body’s main stress hormone, our phones may be threatening our health and shortening our lives.

If they happened only occasionally, phone-induced cortisol spikes might not matter. But the average American spends four hours a day staring at their smartphone and keeps it within arm’s reach nearly all the time, according to a tracking app called Moment.

“Your cortisol levels are elevated when your phone is in sight or nearby, or when you hear it or even think you hear it,” says David Greenfield, professor of clinical psychiatry at the University of Connecticut School of Medicine and founder of the Center for Internet and Technology Addiction. “It’s a stress response, and it feels unpleasant, and the body’s natural response is to want to check the phone to make the stress go away.”

But while doing so might soothe you for a second, it probably will make things worse in the long run. Any time you check your phone, you’re likely to find something else stressful waiting for you, leading to another spike in cortisol and another craving to check your phone to make your anxiety go away. This cycle, when continuously reinforced, leads to chronically elevated cortisol levels. And chronically elevated cortisol levels have been tied to an increased risk of serious health problems, including depression, obesity, metabolic syndrome, Type 2 diabetes, fertility issues, high blood pressure, heart attack, dementia and stroke.

(Catherine Price. www.nytimes.com, 24.04.2019. Adaptado.)

According to the text, smartphones may

(Gil Vicente. Auto da Barca do Inferno. Adaptado.)

¹ batel: pequena embarcação.

Leia o excerto sobre a preparação dos rapazes na Grécia Antiga para exercer seu papel de cidadão e pai de família.

(Gil Vicente. Auto da Barca do Inferno. Adaptado.)

¹ batel: pequena embarcação.

De acordo com o geógrafo José Carlos Ugeda, além dos claros riscos de incêndios florestais, as queimadas podem — a longo prazo — destruir a “vida” do solo.

(Fabio Manzano. www.g1.globo.com, 23.08.2019. Adaptado.)

A destruição da “vida” do solo está relacionada, neste caso, com

O Ceará, apesar de restrições de renda, destaca-se em alfabetização. Um dos motivos do êxito é a parceria com os municípios, os principais encarregados dos primeiros anos de escolarização.

Além de medidas que incluem formação de professores e material didático estruturado, o governo cearense acionou um incentivo financeiro: as cidades com resultados melhores recebem fatia maior do ICMS, com liberdade para destinação dos recursos.

O modelo já foi adotado em Pernambuco e está sendo implantado ou avaliado por Alagoas, Amapá, Espírito Santo e São Paulo.

Replicam-se igualmente as boas iniciativas do ensino médio em Pernambuco, baseado em tempo integral, que permite ao estudante escolher disciplinas optativas, projeto acolhido em São Paulo.

Auspiciosa, essa rede multilateral e multipartidária pela educação é exemplo de como a sociedade pode se mobilizar em torno de propostas palpáveis.

(“Unidos pelo Ensino”. Folha de S.Paulo, 27.08.2019. Adaptado.)