The formula p = 8n - 30 gives the profit p when a number of items n are each sold at $8 and expenses totaling $30 are subtracted. a. If the profit is $170.00, how many items were bought?
b. If the same number of items were bought but the expenses changed to $40, would the profit increase or decrease, and by how much? Explain.

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answers

\3. yes the presentation (i.e. odd numbers being written as differences of two squares) is possible for all odd natural number however the presentation may not be unique. for example,  57=112−82=292−28257=112−82=292−282.

\4. 2 can't be written as a difference of two squares because 4-1=3 and 1-1=0 and the difference of squares grows to integers larger that 3.

can i get some in proving questions 1 and 2?