7th grade maths
Step by step explain each question! Thanks!

What is the 12th term of b(n)=-4-2(n-1)

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c

50 points and will mark brainlest if you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no? = explain your mathematical thinking: