Plz help me I will mark brainiest

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)