A1. 12 i.e option D
A2. 3n-7 i.e option A
A3. -6n+20 i.e option D
A4. -70 i.e option C
Step-by-step explanation:
aₙ = a₁ + (n - 1) × d
aₙ = the nᵗʰ term in the sequence
a₁ = the first term in the sequence
d = the common difference between terms
Using the above formula to solve the first part, we have :
For the second part, we have :
For the third part, we have :
For the fourth part, we have :
When raised to the third power, it is the number times itself three times.
-2(-2) = 4
4(-2) = -8
Answer:
Length of other board 
metres
Step-by-step explanation:
Given: Length of board = 
metres
Length of board was divided into two.
Length of one piece = 
metres
Let 
= length of the other board
Length of the other board = Length of board - Length of one piece
So, 
Thus, length of the other board metres
Answer:
x=-7/3 and y=-6
Step-by-step explanation:
6x-3(3x+1)=4
6x-9x-3=4
-3x-3=4
-3x=7
x=-7/3
y=3(-7/3)+1
y=-6
Answer:
I believe its 2 so sorry if im wrong
Step-by-step explanation:
