Sabendo que  quais são os possíveis valores para cos(x)?

(UFGS) O sulfato de cálcio CaSO₄ possui produto de solubilidade igual a 9 x 10^-6. Se uma quantidade suficientemente grande de sulfato de cálcio for adicionada a um recipiente contendo 1 litro de água, qual será, ao se atingir o equilíbrio, a concentração, em mol/L esperada de Ca²⁺ em solução aquosa?

Texto base: Leia a tirinha a seguir, da Turma da Mônica.    

Enunciado:

“- Cebolinha! Posso usar o seu sapato? 

- Clalo, Cascão!”

Explique o que o personagem Cebolinha inferiu para responder à pergunta realizada por seu colega Cascão.

Read the text and choose the correct alternative according to it. Our solar system  Our solar system is the system of planets and other objects that orbit our sun. It has many parts. Our sun, the star of our solar system, holds everything in place by its gravity. There are eight planets and many moons. There are asteroids and comets. There are meteoroids and tiny particles of rock and dust. The sun, which is actually a star, is the largest object in the solar system. It contains more than 99% of the mass of the solar system. Our sun provides all the energy for life on Earth. Without its heat, Earth would be too cold to live on. Without its light, plants could not grow, and there would be no food for people and animals. Recently the International Astronomical Union (IAU) changed the definition of a planet, so Pluto no longer qualifies. Now we have eight planets in our solar system. Except for Mercury and Venus, all of the planets have at least one moon or natural satellite of their own. The planets are divided into two kinds: the terrestrial planets and the gas giants. The first four planets outward from the sun are classified as terrestrial planets. They are Mercury, Venus, Earth, and Mars. They are called terrestrial because they have a solid, rocky surface with metal cores. They are also sometimes called the rocky planets or inner planets. Vadim Sadovski /Shutterstock

Why do the planets orbit the sun?

Texto base: Follow the dialogue.   Mrs Blanchet meets Mark, one of her students, and his mother, Mrs McConnachie in the street in Toronto. 

Mrs Blanchet: 

Good 1) _______________, Mrs Breuer. 

Mark: 

Good 1) _______________, Mrs Blanchet. How are you? 

Mrs Blanchet: 

I'm 2) _______________ thanks, and you? 

Mark: 

Not too bad. Mrs Blanchet, this is my mother, Mrs McConnachie. Mom, this is Mrs Blanchet, my English teacher. 

Mrs McConnachie: 

3) _______________ to meet you. 

Mrs Blanchet: 

3) _______________ to meet you too. Are you from Canada, Mrs McConnachie? 

Mrs McConnachie: 

Yes, the west coast, from Vancouver. And you, are you 4) ______________ Toronto? 

Mrs Blanchet: 

No, I'm from Montreal, but I 5) _______________ in Toronto now. 

Mark: 

Well, 6) _______________ Mrs Blanchet, it was nice to see you. 

Mrs Blanchet: 

Yes, 6) _______________. 

  Enunciado:

a) Use the missing words from the dialog to complete the crossword.

b) Answer the greetings and keep the conversation going.

 1- Hi, How are you doing?

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2- Let me introduce my mom. Her name is Joanne.

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3- It was nice to meet you. I have to go now. See you later.

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