B

9000153605

Level: 
B
Give a verbal description to the angle shown in the picture.
The angle between opposite edges.
The angle between a triangular face and an edge from the opposite triangular face.
The angle between two opposite triangular faces.
The angle between two triangular faces having a common edge.

9000150106

Level: 
B
Evaluate the following integral on the interval \(\left(\frac25;+\infty\right)\). \[ \int \frac{7} {2 - 5x}\, \mathrm{d}x \]
\(-\frac{7} {5}\ln |2 - 5x| + c,\ c\in \mathbb{R}\)
\(- \frac{7} {5\cdot \ln |2-5x|} + c,\ c\in \mathbb{R}\)
\(\frac{7} {5}\ln |2 - 5x| + c,\ c\in \mathbb{R}\)
\(\frac{7} {5\cdot \ln |2-5x|} + c,\ c\in \mathbb{R}\)

9000151302

Level: 
B
Find the angle \(\varphi \) between the lines \(p\) and \(q\) given by their parametric equations. \[ p\colon \begin{aligned}[t] x& = 1 + 2t, & \\y& = 3 - 3t;\ t\in \mathbb{R}, \\ \end{aligned}\qquad q\colon \begin{aligned}[t] x& = 2 - k, & \\y& = 3 + k;\ k\in \mathbb{R} \\ \end{aligned} \]
\(11^{\circ }19'\)
\(88^{\circ }41'\)
\(45^{\circ }45'\)
\(54^{\circ }12'\)

9000153304

Level: 
B
Two students performed repeated measurements of the same length. After evaluating statistical characteristics they got equal means of the length. Which of the following statement is true? (Remark: The accuracy is determined by the coefficient of variation.)
There is not enough information to compare the accuracy of both measurements.
One of the students measured with a better accuracy than the other.
Both students did their measurements with the same accuracy.