Question

Help me pleaseeeeeeeeeeeeeeeeeeeeee

Answer 1

Answer:

A

Step-by-step explanation:

$s=\frac{a+b+c}{2}$

multiply both sides by 2

$2s = a + b +c$

substract b and c from both sides to get a by itself

$a = 2s - (b + c)\\a = 2s - b - c$

so the answer is A.