Risolvi per $x$ e $y$:  \[ \begin{eqnarray} a_1x+b_1y&=&c_1\\   a_2x+b_2y&=&c_2 \end{eqnarray} \]

Cálculo de forma normal reducida por filas.

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Student ma za zadanie zbudować szereg rozdzielczy, obliczyć średnią i odchylenie standardowe, określić kierunek asymetrii oraz koncentrację rozkładu.

Wybór rodzaju zmiennej (ilościowa lub jakościowa). 

Zadaniem studenta jest wyznaczenie miar pozycyjnych dla losowego zbioru 32 wartości.

A demo of the main new features in Numbas v5: explore mode, alternative answers and "Choose from a menu" question navigation.

All the answers in this question are equations. In order to mark each equation, Numbas needs to pick some values that satisfy the equation and some that don't, and check that the student's answer agrees with the expected answer.

Any equation with the same solution set as the expected answer will be marked correct.

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Simple exercise in collecting terms in different powers of \(x\)

Factorise three quadratic equations of the form $x^2+bx+c$.

The first has two negative roots, the second has one negative and one positive, and the third is the difference of two squares.

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Simple exercise in collecting terms in different powers of \(x\)

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