10. The value of the 8th term is 78. The sequence is increasing by 10 at each step.
Explicit equation: y = 10x - 2
Recursive: now = previous term + 10
Find the 9th term.
Explanation:

answer: hence, function will be

explanation:

since we have given that

cost of a new textbook = $85

according to question, the resale value of a textbook decreases by 25% with each previous owner,

so, our function becomes,

here, y is the total value of the text book after x owners.

hence, function will be

one triangle is 2.5 times bigger than the other triangle.