#### Find x in the exponential equation

Find the value for $x$ using the properties of powers: $2^{x+3}=2^{6}⋅3^{x-3}$

# Powers of integer exponent

Training
13

#### National Holiday

Within the framework of the celebration of the German unity day, the 3rd of October, the students of Pieter's class are going to organize a set of activities to be done at their school, with the objective of sensibilizing families about the importance of this holiday. Pieter's class has 23 students, which 14 are girls. The teacher is going to randomly choose a student to receive the families. What is the probability of the student chosen being a boy?

# One-stage random experiments

Reasoning
8

#### Interquartile range

Consider this sample: $${45,47,49,50,52,55,57,60,63,65}$$ Now, find the interquartile range.

# Mean & median

Training
6

#### Negative Powers

This it's a multiple choise question. Consider the power: $5^{-2}\;+\;7^{-3}$ . This Power can be represented in other way. Choose the correct aswer.

# Powers

Training
8

Investigators did a test to find out the absolute frequency of how many students missed school in a week. There are 230 students. Number of days: $${Day 1...Day 7}$$ Absolute frequency: $${0,6,7,4,1,3,2}$$ What is the relative frequency? Please round to three decimal digits here.

# Absolute & relative frequency

Training
5

#### Natural Logarithm

Fill in the blank spots.

# Exponential properties

Learning
11