Over the course of a year, a classroom went from 15 students to 19 students. use the drop-down menus to build an equation that could be used to find the percent change, p , in the number of students.

The percentage change is 26.7 % .

Step-by-step explanation:

Formula

Where change in value = Final value -  initial value

As given

Over the course of a year, a classroom went from 15 students to 19 students.

Here

Final value = 19

initial value = 15

Put in the above

change in value = 19 - 15

                            = 4

Put in the percentage formula

Percentage change = 26.7 % (Approx)

Therefore the percentage change is 26.7 % .

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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