You share only one distribution, so we'll focus on that one: mean: 30; std. dev.: 4.
Draw a "standard normal curve." Draw a vertical line in the exact middle of your curve. Label this line "30." Now "one standard dev. above the mean" is 30+4=34; "two std. devs. above the mean is 30+4+4=38, or 30+8=38. "three std. devs. above the mean is 30+3(4) = 42.
Now work in the other direction. Start with the mean: 30. But now subtract the std. dev. (4) instead of adding it. You'll get 30-4=26. This is "1 std. dev. below the mean. Continue: find 2 and 3 std. devs. below the mean.
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Answer: -6xy -7y +4x +9
Step-by-step explanation:
Firstly, distribute y to 6x + 7: -6xy - 7y
Next, collect like terms: 4x + 9 -6xy - 7y = -6xy -7y + 4x + 9
The tree is already 24 feet tall and growing at a rate of 2 feet per year. The tree can grow for 17 more years (17*2=34, 34+24=58) before they have to trim it.
