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3 years ago

The formula to find a certain number in an arithmetic sequence is an=a1+d(n−1) .

Mathematics

1 answer:

REY [17]3 years ago

7 0

Answer:

(an -a1)/d +1 = n

Step-by-step explanation:

Undo what is done to n, in reverse order. When evaluating this expression, you ...

subtract 1 from n
multiply the difference by d
add a1

When you undo these, you get ...

... an -a1 = d(n-1) . . . . . . subtract a1

... (an -a1)/d = n - 1 . . . . divide by d

... (an -a1)/d +1 = n . . . . add 1

_____

<em>Comment on answer list</em>

Please note the use of parentheses in the answer here. These identify that the difference (an -a1) is what is divided by d. None of the offered answers has these parentheses, nor are they typeset in a way that would indicate the intent to divide (an -a1) by d. As given, none of the offered answers is correct.

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2 years ago

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The given parameters;

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number of each shape = 5

area of each square shape tiles, A = 2000 cm²

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To find:

the smallest number of tiles Quintin will need in order to tile his floor

Among the three different shapes available, total area of one is calculated as;

$A_{one \ square \ type} = 5 \times 2000 \ cm^2 = 10,000 \ cm^2$

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$maximum \ number= \frac{Area \ of \ floor}{total \ area \ of \ one \ shape \ type} \\\\maximum \ number= \frac{600,000 \ cm^2}{10,000 \ cm^2} \\\\maximum \ number= 60$

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Learn more here: brainly.com/question/13877427

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