Question

A1=7,5 , d= −2,5 a2=...?

Answer 1

А2=а1+d.
a2=7,5-2,5=5.

Answer 2

It looks like you're dealing with an arithmetic sequence where you have the first term A1 = 7.5, the common difference d = -2.5, and you want to find the second term A2.

To find A2, you can use the formula for the nth term of an arithmetic sequence:

A_n = A_1 + (n - 1) * d

In this case, you want to find A2, so n = 2. Plug in the values:

A2 = 7.5 + (2 - 1) * (-2.5)

A2 = 7.5 + (1) * (-2.5)

A2 = 7.5 - 2.5

A2 = 5

So, A2 is 5.