## All Tasks

#### Photo

For the print of posters an online-company calculates 13.50 € for three poster.
Calculate the costs of ten posters.

# Proportionality

Modeling

7

#### Calculate gradient

Calculate the gradient of the function given by the picture.

# Proportionality

Training

8

#### Gradient m>0

Cross all correct statements of a proportional function.

# Direct proportionality & rule of three

Reasoning

7

#### Proportional graph

Select the graph of a proportional function.

# Direct proportionality & rule of three

Reasoning

7

#### The Bridge

One can describe the railway bridge as quadratic function $f(x)=ax^2+bx+c$. Calculate the value of the factor $a$ in the term of the quadratic function.
Note: One meter is equal to one unit of length. Round to two decimal numbers.

# Quadratic functions

Modeling

9