Find the missing angle in the triangle below

30 degrees

Step-by-step explanation:

The three angles of a triangle will always add up to 180.

So,

20 + 130 + ? = 180

150 + ? = 180

? = 180 - 150

? = 30 degrees

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