PLZ HELP!!>\\< [Maximum mark: 6]
The equation of a line L, is 3.x = 12 - y.
(a) For the line L1, find:
(i) the r-intercept;
(ii) the gradient.
A second line, L2, intersects the r-axis at P(2.0) and is parallel to L.
(b) Find the equation of L2, giving your answer in the form y=mr +c.
(c) Calculate the y-intercept of L2.

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec