Mathematical analysis

Due to COVID-19 pandemic, lectures are sent to students as recordings. One of the lectures is 45 minutes long. What should Helen do to find out, how long will it take her to listen to the lecture, if she changes the speed of the recording to 1.25x

Identify the steps that are needed to solve the problem and to get the right answer.

There may be more than one correct answer.

• First, determine how much is the 1/4 of 45

• Multiply 45 by 0,8

• Secondly, subtract the forth part from 45

• Subtract 20 percent from 45

Think mathematically and choose the correct missing word: There are 10 types of people in the world: Those who understand _______ and those who don't.

• probability theory

• decimal system

• binary

• integer

Nick wrote a number, which is greater than 8 by this number's 50%. Find out the number Nick wrote.

Identify the steps that are needed to solve the problem and to get the right answer.

There may be more than one correct answer.

• Determine how much is 50% of 8.

• Increase 8 by its 50%

• Multiply 8 by 2

• Multiply 8 by 1,5

Anakin is 22 years older than Luke. Determine if the sum of their ages is an odd number or even?

• odd

• even

• impossible to determine

All sides of a square were increased 2 times. How many times did the area of the square increase?
Identify the steps that are needed to solve the problem and to get the right answer.
There may be more than one correct answer.

• Determine the formula of the square area $S=a^2$  

• Multiply 2 by 4

• Determine how much is square of 2

• Determine how much is square of 8