"João vendeu sua bicicleta a 360 reais, o que era 80% do que ele havia pago. Por quanto ele deveria ter vendido para ter um lucro de 20%?"​

Which is the most efficient first step to solve x in the equation 3.7x - 18 = -4.3x -34 a. add 3.7x to both sides of the equation. b. add 4.3x to both sides of the equation. c. subtract 18 from both sides of the equation. d. subtract 34 from both sides of the equation.

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

Explain why the factor 1.5 is broke. into two numbers in the model.