Im confused, not sure how to do this. me it is geometry, specifically perpendicular lines with an equation and a point

1. are the triangles similar and if so why? what is the value of x? show your work.

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =