On a school field trip, the school requires that there are 6 teachers for every 90 students. if 135 students attend the trip how many teachers are needed? write and solve a proportion showing your work. (3 points)

the answer is 9 teachers

Step-by-step explanation:

step one is 135-90=?

step two is if  1 teachers for 15 students

2 techers are for 30 students until you get to 135

9 teachers.

Step-by-step explanation:

We can visualize the information given as follows:

Students        teachers

   90         ⇒        6

   135        ⇒        x

Which tells us that for 90 students 6 teachers are needed, and for 135 students we have the unknown quantity of teachers x.

To find x we multiply the two cross quantities, and divide by the remaining amount

x = (135)(6) ÷ 90

x = 810 ÷ 90

x = 9

9 teachers are needed for 135 students.

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.