C | math4u.vsb.cz

2000004308

Level:

C

The function

f

is graphed in the picture. Which of the following is its equation?

f (x) = | x^{2} - 4 x |

f (x) = | x^{2} + 4 x |

f (x) = | x^{2} | - 4 x

f (x) = | x^{2} | + 4 x

2000004307

Level:

C

The function

f

is graphed in the picture. Which of the following is its equation?

f (x) = | x^{2} - 4 |

f (x) = | x^{2} + 4 |

f (x) = | x^{2} - 2 |

f (x) = | x^{2} | + 4

2000004204

Level:

C

Choose the function that has its graph shown in the picture.

f (x) = 2 - | \sin x |

f (x) = 2 + | \sin x |

f (x) = | \sin x | - 2

f (x) = | \sin 2 x |

2100004203

Level:

C

Which of the graphs is the graph of the function

f (x) = | 1 + \cos x |

?

2000004202

Level:

C

On the interval

(- \frac{π}{2}; \frac{π}{2})

, simplify the expression

\frac{\sin 2 x}{1 - \sin^{2} x}

.

2 tg x

tg x

{tg}^{2} x

1 - tg x

2000004201

Level:

C

On the interval

(0; π)

, simplify the expression

\frac{2 \sin x + \sin 2 x}{2 \sin x - \sin 2 x}

.

\frac{1 + \cos x}{1 - \cos x}

\frac{1 - \cos x}{1 + \cos x}

1 + \cos x

1 - \cos x

2000003411

Level:

C

Two dice are thrown, white and red. What is the probability that the white dice shows three, if the sum on both dice is four?

\frac{1}{3}

\frac{1}{6}

\frac{1}{4}

\frac{1}{9}

2000003410

Level:

C

Today, there are

11

boys and

9

girls in the class, including Caroline. What is the probability of Caroline being examined if the teacher selects a girl?

\frac{1}{9}

\frac{1}{20}

\frac{9}{20}

\frac{9}{11}

2000003405

Level:

C

Statistics show that

80 %

of working women use a computer at work. Let’s randomly select two women from the group of working women. What is the probability that both women use a computer at work?

0.64

0.8

0.16

0.32

2010001406

Level:

C

All

96

children in the summer camp were to choose the chocolate champion - between milk chocolate and dark chocolate. At the end milk chocolate got

30

more votes than dark chocolate.

26

children couldn’t decide though and gave their votes to both chocolates. How many votes did dark chocolate get?

46

76

26

82

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