1) Wendy is carpeting her bedroom floor. The room measures 11 ft by 13 ft. She also has a closet that she wants to put carpeting in that has the dimensions 3 ft by 7 ft. How many square feet of carpeting does she need all together? 2) If the carpeting for Wendy's bedroom costs $1.98 per square foot, how much will it cost Wendy to carpet her bedroom?

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9 x 8 divided by (5-3)=36

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