Mr. abed tries a new mathematics game to his third grade students learn their multiplication tables and records the results. this would best be described as which of the following?

group of answer choices
a. true experiment
b. one-shot case study
c. one-group
d. pretest–posttest design
e. correlational research

D Pretest–posttest design

Step-by-step explanation:

According to the question, Mr Abed is just designing the game and the purpose is to help the grade 3 students learn their mutiplication table, upon completion of the game design, the students are to use (play) it - all this makes up the pretest stage

The result of the game will then be evaluated by Mr Abed to Know if the game is effective or not, if the students have actually learnt their multiplication table by playing the game, if there is need for modification - all this makes the posttest stage.

The numbers are 29, 87 and 129.

To find these, you have to first assume that the first number is equal to x. After that we can write statements for the other numbers based on that. The second number is three times the first, which makes it 3x. The third is 100 more than the first, which makes it x + 100. Now we can add these 3 together and set equal to 245 to solve.

x + 3x + x + 100 = 245 > Combine like terms

5x + 100 = 245 > Subtract 100 from both sides

5x = 145 > Divide both sides by 5

x = 29

You can then plug the 29 into each of the other equations to find the remaining numbers.

3x = 87

x + 100 = 129