Answer:
3.5
Step-by-step explanation:
the sqr root of 4 is 2
the sqr root of 3 is 1.5
Traditional 1/2 * base * height
Heron’s formula (it’s quite lengthy so search it up)
Hope this helped you :)
Let 
= -9, 
= -12 and so on.
-15 = -9 + (-6)
-15 = -9 + 2(-3)
Let -3 be the common difference, or <em>d</em>.
= -9 + n(-3)
= -9 - 3n
Please check, i'm not entirely sure but i'm decent enough.
1 is A 2 is D3 is B
Good luck.
Move the 8 over
-x=3x-8
Move the 3x over
-x-3x=8
-4x=8
Divide by -4
x=-2
