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What are the soultion(s) to the quadratic equation 40- x^2=0

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

What are the domain and range of the function f(x)=2^x+1