If a telescope originally costs $539.99 the tax rate is 10%. what is the total? pls someone explain how to solve these type of problems pl im not asking for a answer just explaining and possibly a example PLSS HELP ITS DUE IN 10 MINUTES

Given: f(x) = 2x + 5 and g(x) = x2 and h(x) = -2x h(g(f( = x2+ vx+ x + y

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left