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.

No description given

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.

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.

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

The answer to this question is a differential equation involving $y''$, $y'$ and $y$.

A variable value generator for $y$ ensures that the right values are tested to check that the student's answer is equivalent to the expected equation.

Sirve para usar con el muro de fracciones

A student selects a card from a deck of 52 and rolls a dice once.

rebelmaths

Find the tensions is a system of cables supporting two loads.

Match up equations with the corresponding lines on a graph.

This question includes a JavaScript preamble which defines 'hbar' as a special variable name to be rendered in LaTeX as \hbar.

Multiplication of $2 \times 2$ matrices.

Determine if various combinations of vectors are defined or not.

Calculating the missing side-length of a triangle using the cosine rule.

Given two angles and a side-length of a triangle, use the sine rule to calculate an unknown side-length.

No description given

Assessment of basic knowledge of confidence intervals; no randomisation.

sin vertically shifted Working 1_11_16

No description given

Simple truss with a zero-force member

Given the graph the student enters the equation

Ready to use

Given the graph the student enters the equation

Ready to use