1) Correct
2) Incorrect
First statement is also True.
When y= 2, numerator becomes 0, then slope = 0 which is a horizontal line.
Answer: C
3) Incorrect
Coffee cannot become cooler than room temp, so options A and B are eliminated. The coffee went from 100 to 80 in 1 min, this is half the difference to room temp of 60. In the next minute it would decrease half the distance again, from 80 to 70. In the 3rd minute, from 70 to 65, 4th minute, 65 to 62.5
Answer: C
4) Incorrect
Solve equation for dy/dx, you get a linear function. The anti-derivative of a linear function is a quadratic function, which is a parabolic curve.
Answer: C