The depth y (in inches) of a lake after x years is represented by the equation y=0.2x+42. How much does the depth of the lake increase in four years?

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.