Two spinners have been spun 100 times. using the experimental probabilities below, what is the best guess for the number of times these spinners would land on the same number in 10 spins? a) 1, b) 2,c) 7,d) 8 p(a)=21 p(a')=79

i belive those are the ones that are under 90 degreese.

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