Okay, so for the following question I was able to answer half of the parts. I can't figure out how to do B & D..

Newborn blue whales are approximately 24 feet long and weigh 3 tons. Young whales are nursed for 7 months, and by the time of weaning they often are 54 feet long and weigh 23 tons. Let L and W denote the length (in feet) and the weight (in tons), respectively, of a whale that is t months of age.
(a) If L and t are linearly related, express L in terms of t. (Give your answer in slope-intercept form.)

L=30t/7 + 24

(b) What is the daily increase in the length of a young whale? (Use 1 month = 30 days. Round your answer to three decimal places.)

???

(c) If W and t are linearly related, express W in terms of t. (Give your answer in slope-intercept form.)
W=20/7t + 3

(d) What is the daily increase in the weight of a young whale? (Round your answer to three decimal places.)

???

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