Find a negative real number such that the square of the sum of the number and 9 is equal to 100. NO LINKS OR PICTURES BC CANNOT OPEN

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So don't take my word i'm not exactly a mathematical person but i would assume a. because while selling the soap every month you increase in sells so you would by 11 percent. the you would get the factor 0.89 which if i had to guess would be the monthly profit over 11 probably wrong tho