In a school there are a total of 480 students, the ratio of boys to girls is 8: 7 how many girls are there?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

X2 + y 2 = 36 x + y = 6 solve the system of equations.

Si la base de un triángulo isósceles mide 70 m y el ángulo opuesto a ésta mide 58°; entonces ¿cuánto mide la altura de dicho triángulo? a) 21.87 m. b) 40.01 m. c) 43.74 m. d) 63.14 m.