Question

$what \: is \: the \: common \: differece \\ \: of \: an \: ap \: whose \: an = - 3n + 7$
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Answer 1

Step-by-step explanation:

A(1)=-3(1)+7=4

A(2)=-3(2)+7=1

common difference=1-4

=-3 ANSWER.....

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Answer 2

$\longrightarrow\sf\red{Statement 1:}$

We can keep adding the terms of A in order, and stop when the sum reaches 275. We would know x is the index of the last term we added, so x is a confirmed value, sufficient.

$\longrightarrow\sf\pink{Statement 2:}$

The range is 30 while the common difference is 3, so there are 10 differences and 11 terms in total. Then x = 11, sufficient.