Simplify the equation cosx/tanx

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

The graph of f(x) = |x| is transformed to g(x) = |x + 11| - 7. on which interval is the function decreasing?