I need help with my quiz

Will give find an equivalent function to f(x)=5(2)^3x. the 5(2)^3x means 5(2) to the 3x power answer choices: a: f(x)=125^x(8)^x b: f(x)=10^2x c: f(x)=40^x d: f(x)=5(8)^x

The water has been on the stove y=9.5x+62.1 after how many minutes will the tempature be 138.1 f

15 there is a line that includes the point 0,10 and has a slope of 7/4. what is it’s equation in slope intercept form