Justify each step in the solution path to solve the system of equations {4/5x+6y=15} {-x+18y=11.} I WILL GIVE BRAINLIEST!!

Prove the following(cot0+cosec0)[tex](cot0 + cosec0) { }^{2} = \frac{1 + cos0}{1 - cos0} [/tex]

There are a total sales of 2,000 dollars on monday on tuesday sales dropped 10% on wednesday sales dropped another 20% compared with tuesday from wednesday to thursday sales increases by an equal amount to 25% of monday total sales what is the net change in dollars on total sales from monday to tuesday

In the figure, ab = 14 inches, ac= 16 inches,ay=9 inches, and bz = 10 inches find the area of the triangle abc. answer quick