You can do this by cross multiplying
An equation:
It is used to express exact values.
Therefore, we will use an equation when when know that the quantity given is strictly equal to a given value.
Examples:
1- Price of a kilo of apples is $2
This is translated as ........> cost of 1 kilo = $2
2- The length of a ruler is 30 cm
This is translated as ......> length = 30 cm
An inequality:
It is used to show relation or compare between a quantity and a value. Therefore, we use it when we find keywords as "at least, at most, greater than, less than, ..... etc"
Example:
1- The distance between two cities is at least 20 miles.
This means that the distance can be 20 miles or more
This is translated as:
distance ≥ 20 miles
Remember that
A statistical question is a question that can be answered by collecting data that vary.
so
Classify
Hw tall are the memmbers of my class? -------> Is a statistical question
How tall am i? --------> is a nonstatistical question
How old are the students in my school? -------> Is a statistical question
A statistical question can be measured and controlled, while a nonstatistical question cannot provide for the measurement.
You add the number of places from the number to the decimal.
In this case .002 is 3 place and so is .003
The answer is .000006
Miss lees class collected 3 more ball because 21-18 is 3. if i collect 18 balls and my friend collects 21 balls and then we add 21+18 we get 39 and then we put 39 in 13 equal groups we have 3in each group that is why they collected 3.
21-18=3
add 21+18=39
put in equal groups
divide 39 with 3 get thirteen make equal group get 3 in each group
*21-18=3
*21+18=39
*39 divided with 3=13
* 3 in each group
*Answer 3
