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Gabriela is building a brick wall. Each row of bricks is 6.5 cm tall except that the top row is 1 cm shorter because it has no mortar. She wants the wall to be 259 cm tall. Which equation can we use to determine r, the number of rows of bricks Gabriela needs in her wall?

Respuesta :

Answer:  6.5 (r-1) + 5.5  = 259 or 6.5 r - 1 = 259

Step-by-step explanation:

Here, r represents the total number of rows.

According to the question each row is 6.5 cm tall.

And, the top row is 6.5 - 1 = 5.5 cm tall

Except this row total number of rows = (r-1)

Thus, the total length of these rows = 6.5 (r-1)

Hence, the total length of wall = total length of (r-1) row + total length of top row.

But Again according to the question,

The wall must be 259 cm tall.

⇒ 259 = 6.5(r-1) + 5.5

⇒ 6.5(r-1) + 5.5 = 259

⇒ 6.5 r - 6.5 + 5.5 = 259

⇒ 6.5 r - 1 = 259

Which is the required equation for finding the number of rows (r).

ninjathan300

Answer:

The answer is B. 6.5r - 1 = 259

Step-by-step explanation:

The answer is right because I got it right on khan Academy.

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