Aschool ordered 3 large boxes of board markers. after giving 15 markers to each of 3 teachers, there were 90 markers left. the diagram represents the situation. how many markers were originally in each box?

45 markers in each box.

Step-by-step explanation:

Initially, the school had 3 boxes of board markers, and each box had X board markers, where X is the number we want to find.

Then the initial number of board markers is 3*X.

We know that after giving 15 markers to 3 teachers, we have other 90 markers left. This can be written as:

total markers = markers for the teachers + markers left

3*X = 15*3 + 90 = 45 + 90 = 135

now, we divide both sides by 3.

X = 135/3 = 45

From this, we know that in each box we have 45 markers

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer

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