Help me pLEASE ! do it step by step so I can see how y'all do it.

The triangles are similar. what is the value of x? show your work.

What is the standard form of -5x^2+2x^4-11+x^3+3x

The table below shows the height of a ball  x  seconds after being kicked.  what values, rounded to the nearest whole number, complete the quadratic regression equation that models the data? f(x)  =  x2  +  x  +  0based on the regression equation and rounded to the nearest whole number, what is the estimated height after 0.25 seconds?   feet