urgent help please

1) The EQUATION for the estimated Least Squares Regression Line for a study on how long equipment will last is AGE in months = -148 + 12*CORE STRENGTH

What is the value of the y-intercept?

Is the correlation between age and core strength positive or negative?

2) There appears to be a strong positive correlation between the number of firefighters at a fire and the amount of damage the fire does. Choose the statement that is most likely true:

a. We should assign fewer firefighters to a fire to decrease the amount of fire damage.

b. The more firefighters present, the less damage a fire is likely to cause.

c. Bigger fires cause more fire damage and more firefighters are likely to be present at bigger fires.

d. A mistake in reporting likely led to this misunderstanding.

3) Which of the following statements shows a causal relationship and not just a correlated one, a, b, c, or d?

a. An individual's decision to work in construction and his diagnosis of skin cancer.

b. A decrease in temperature and the increase in attendance at an ice skating rink.

c. As a child's weight increases so does her vocabulary.

d. The number of minutes spent exercising and the number of calories burned.