Alguém sabe como q faz essa equação? Preciso Rápido.

4x - x(x - 4) = -9

Answer the following for 896.31 cm= km 100cm = 1m 1000m = 1km a) 0.0089631 b) 0.0089631 c) 8.9631 d) 89.631

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)