P = 2l + 2w
P = 2(8.4) + 2(4.8)
P = 16.8 + 9.6
P = 26.4cm
The first term is 8, so
Each time we want a new term, we add on 3
8+3 = 11
11+3 = 14
14+3 = 17
17+3 = 20
23+3 = 26
and so on
This recursive step of adding on 3 to the prior term is written as this: which says "to get the nth term, add 3 to the term just before the nth term"
Based on what you posted for your answer choices, the final answer is likely choice C. However it seems some weird typo happened.
Y - 9 = 2(x - 1)
This is because the base equation is below:
y - y1 = m(x - x1)
If the length of the ladder is x then 12/x=cos70, so x=12/cos70=35’ approx, answer c.