Please I need help for this one, thank you soo much

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Ответ:

heavenwatkins789

11.08.2020

Mathematics

The correct option is A) $d=\frac{a_n-a_1}{n-1}$

Step-by-step explanation:

Consider the provide equation.

a_n=a_1+d(n-1)

We need to solve the equation for d.

Subtract a_1 from both sides

a_n-a_1=a_1-a_1+d(n-1)

a_n-a_1=d(n-1)

Divide both sides by n-1.

$\frac{a_n-a_1}{n-1}=\frac{d(n-1)}{n-1}$

$d=\frac{a_n-a_1}{n-1}$

Hence, the correct option is A) $d=\frac{a_n-a_1}{n-1}$

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