-7(n+3)-8(1+8n)
Find answer

-7n-21-8-64n distributive property -7n-64n-29 commutative property -51n-29 combine like terms

Takes -7multiplies the term n + 3. we have -7n -21. and -8 multiplies each term of 1+ 8n we have : -8  -64n.

here are numbers :
-7(n+3) - 8(1 + 8n)
-7n -21 -8 -64n= 0 (then take all the number to the other side. = 21 +8 = 29)
-81n = 29
n = 29/ -81

Given:

Consider the below table attached with this question.

Every square meter of ceiling requires 10.75 tiles.

To find:

The missing values in the table.

Solution:

We have,

1 square meter of ceiling =  10.75 tiles.      ...(i)

Therefore, the number of tiles corresponding to 1 square meter of ceiling is 10.75.

Multiply both sides by 10.

10×1 square meter of ceiling =  10×10.75 tiles.

10 square meter of ceiling =  107.5 tiles.

Therefore, the number of tiles corresponding to 10 square meter of ceiling is 107.5.

Divide both sides by 10.75 in (i).

square meter of ceiling = 1 tile.

Multiply both sides by 100.

square meter of ceiling = 100 tiles.

On approximating the value, we get

9.3 square meter of ceiling = 100 tiles.

Therefore, the square meters of ceiling corresponding to 100 tiles is about 9.3.

Multiply both sides by a in (i).

a×1 square meter of ceiling =  a×10.75 tiles.

a square meter of ceiling =  10.75a tiles.

Therefore, the number of tiles corresponding to a square meter of ceiling is 10.75a.