The following dot plot represents two data sets, A and B.

Which of the following statements is not true?
The range of the two sets is the same.
The mode of set A is 50 less than the mode of set B.
The difference between the median of each set is 40.
Set B has a higher mean than set A.

john earns $14.00 for two hours of work.

set each factor equal to 0

4x-3 = 0

2x-1 = 0

solve for x.

4x-3=0

4x=3

x= 3/4

solve for x. 

2x-1= 0

2x= 1

x= 1/2

eventually after a few more steps, your answer should be 1/2 is less than or equal to x and 3/4 is greater than or equal to x

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this