A ladder is leaning against a wall. The ladder is 18ft long and the foot of the ladder is pulled out 4.5 ft from the wall. What is the angle of elevation that is made with the ground?

43

step-by-step explanation:

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

the correct answers i think are b. and d.

give me brainliest if it is correct!