Hi there! f(18) makes the value of x 18 and x is the number of movies watched in 1 month. Therefore, A and C are eliminated because we’re talking 18 movies, not 18 months. B is also out, because Kelsey would pay more than $27 a month for the service, especially with the service fee. 18 * 1.50 is 27 and 27 + 12.50 is 39.50. Kelsey spends $39.50 a month watching 18 movies per month. The answer is D.
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➷ The range is the highest value minus the smallest value
Therefore, you just need to subtract the two values to find the values:
-2 - 4 = -6
The difference is just 6, so your answer is C. 6
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X=y+z
subtract y from both sides
-y+x=z that is your answer
Y+1=[m(the slope)](x+2), y=mx+2m-1, it is impossible to get the answer without the graph.