I think the answer is 6 since u multiply them
Girls: 81
boys: 75
4x +6 = 156
4x = 150
x = 37.5
2x = 75
girls: 75 + 6
boys: x
Here you go you little troll <span>191630195140</span>
Evaluate the derivative of f(x) at x = 1. I'll use the limit definition:

Then using the point-slope formula, the equation of the tangent line to f(x) at the point (1, 5) is
y - 5 = 9 (x - 1)
y = 9x - 4