Assinale a alternativa que indica para quais valores de m o sistema de equações lineares !$ { \begin {cases} x\,\,\,\,-z =0 \\2x + my - z = 0\\x + 2y + mz = 0 \end{cases}} !$ é possível e indeterminado.

Ao longo do desenvolvimento embrionário ocorrem muitas divisões celulares a partir do zigoto. Assim, todas as células que formam o corpo de um indivíduo possuem o mesmo patrimônio genético. Apesar disso, as muitas células que formam o corpo do indivíduo são diferentes. Sobre desenvolvimento embrionário, assinale a alternativa correta.

Cinemas IMAX 3D são considerados uma experiência cinematográfica inesquecível. Apresentam tela de projeção 6 vezes maior, som 4 vezes mais potente e a imagem perfeitamente cristalina é projetada em telas que chegam a ter 25 m de comprimento por 20 m de altura. Com base nessas informações, calcule a área da tela em cm2, expresse seu resultado em notação científica e assinale a alternativa correta.

Considerando !$ a=\dfrac {4\times 18-68}4 !$ e !$ b= 12 - { \Large { 156 \over 13}} !$, é correto afirmar que:

Observa la publicidad a continuación y marca la alternativa correcta.

TEXTO REFERENTE À QUESTÃO

Four years without Big Ben’s bongs? It can’t be right, says UK PM May

LONDON (Reuters) - Prime Minister Theresa May said on Wednesday it could not be right for “Big Ben”, the bell in the British parliament’s clock tower whose bongs (1) , to fall silent for four years during renovations.

May joined other politicians who have protested at the news that the great bell, which has rung every hour for most of the past 157 years, would cease its bongs to ensure the safety of workers carrying out renovations on the tower.

“Of course we want to ensure that people are safe at work, but it can’t be right for Big Ben to be silent for four years,” May told reporters.

“I hope that the Speaker (of the House of Commons) ... will urgently look into this and ensure that we can hear Big Ben through those four years.”

Big Ben’s bongs, which are heard marking the start of some of the BBC’s flagship news bulletins, are part of the soundtrack of daily life in the British capital and beyond.

Officially known as the Elizabeth Tower, the clock tower that houses Big Ben is believed to be the most photographed building in the United Kingdom. May’s comments were more restrained than those of her Brexit minister, David Davis, who said on Tuesday that (2) .

Another Conservative politician, member of parliament Nigel Evans, suggested earlier on Wednesday that the bongs could be switched back on every evening when the workers carrying out the renovations of the clock tower finished for the day.

Steve Jaggs, parliament’s Keeper of the Great Clock, had announced this week that Big Ben would stop its regular chimes at midday (1100 GMT) on Monday, Aug. 21, inviting members of the public to gather nearby to hear the final bongs.

The bell will still toll for important (3) but will otherwise remain silent until 2021.

Reporting by Estelle Shirbon; editing by Michael Holden

(Adaptado de <https://www.reuters.com/article/usbritain- politics-bigben-idUSKCN1AW1HJ> Acesso em 16/08/2017)

What is the official name of the clock tower that houses the famous bell?

Para que o determinante da matriz A² seja nulo, o valor de x em !$ A=\begin{bmatrix} x -1 & 3 \\ 1 & 1 \end{bmatrix} !$ deve ser igual a:

Para explicar o ritmo de crescimento e envelhecimento da população, foi criado em 1920 o Modelo de Transição Demográfica, que classifica o comportamento demográfico em quatro fases. Considerando o exposto, assinale a alternativa que contém a principal razão que influencia nos índices demográficos de uma nação.

TEXTO REFERENTE À QUESTÃO

Four years without Big Ben’s bongs? It can’t be right, says UK PM May

LONDON (Reuters) - Prime Minister Theresa May said on Wednesday it could not be right for “Big Ben”, the bell in the British parliament’s clock tower whose bongs (1) , to fall silent for four years during renovations.

May joined other politicians who have protested at the news that the great bell, which has rung every hour for most of the past 157 years, would cease its bongs to ensure the safety of workers carrying out renovations on the tower.

“Of course we want to ensure that people are safe at work, but it can’t be right for Big Ben to be silent for four years,” May told reporters.

“I hope that the Speaker (of the House of Commons) ... will urgently look into this and ensure that we can hear Big Ben through those four years.”

Big Ben’s bongs, which are heard marking the start of some of the BBC’s flagship news bulletins, are part of the soundtrack of daily life in the British capital and beyond.

Officially known as the Elizabeth Tower, the clock tower that houses Big Ben is believed to be the most photographed building in the United Kingdom. May’s comments were more restrained than those of her Brexit minister, David Davis, who said on Tuesday that (2) .

Another Conservative politician, member of parliament Nigel Evans, suggested earlier on Wednesday that the bongs could be switched back on every evening when the workers carrying out the renovations of the clock tower finished for the day.

Steve Jaggs, parliament’s Keeper of the Great Clock, had announced this week that Big Ben would stop its regular chimes at midday (1100 GMT) on Monday, Aug. 21, inviting members of the public to gather nearby to hear the final bongs.

The bell will still toll for important (3) but will otherwise remain silent until 2021.

Reporting by Estelle Shirbon; editing by Michael Holden

(Adaptado de <https://www.reuters.com/article/usbritain- politics-bigben-idUSKCN1AW1HJ> Acesso em 16/08/2017)

“Which” in the sentence “(…) the great bell, which has rung every hour for most of the past 157 years, would cease its bongs (…)” refers to:

A tabela apresenta o número de inscritos no Exame Nacional do Ensino Médio (Enem), entre os anos de 2011 e 2017.

Observando a tabela, analise as afirmações a seguir.

I) Comparando o Enem 2017 com o Enem 2016, houve uma queda de 10% no número de inscrições.

II) A média do número de inscritos entre 2015 e 2017 é de 8,4 milhões.

III) O recorde do número de inscritos nesse período ocorreu em 2014.

É correto o que se afirma, apenas, em: