En una evaluación de matemática las notas de los alumnos de un curso fueron: 10-7-9-8-10-8-2-8-8-7-9-7-8-7-7-6-6 -6-6-5-9-5-5-9-5-8-5-7-4-4-9-4-3-9- 3-2-1-10-8-6.
¿cuantos alumnos asistieron a la evaluación?

47 - 90 = 43

43 - 180 = x

x = 137

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct

110698.56 square miles

step-by-step explanation:

multiply 3.8 by 102

387.6

multiply 2.8 by 102

285.6

multiply those two to get