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求解三道SAT (Test Prep booklet)上的~没有的话请在这里解答,

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求解三道SAT (Test Prep booklet)上的~没有的话请在这里解答,
23.the diameter and height of a right circular cylinder are equal.If the volume of the cylinder is 2,what is the height of the cylinder?A.1.37 B.1.08 C.0.86 D.0.80 E.0.68
30.The linear regression model C=-1.02F+93.63 is based on an analysis of nutritional data.C:carbonhydrats,F:fat .Based on this model,which of the following statements must be true.
"when 20 percent of calories are from fat,the predicted precent of calores form carbonhydreats is approximately 73."这句话对吗?
33.The number of hours of daylight,d,in Hartsville can be modeled by d=35/3+(7/3)*sin(2 pi *t /365 ) where t is the number of days after March 21.The day with the greatest number of hours of daylight has how many more daylight hours than May.
求解三道SAT (Test Prep booklet)上的~没有的话请在这里解答,
第一题:已知体积,求正圆柱的高,高等于直径,体积等于2,答案为A
第二题:回归方程,答案我个人认为错误的.因为这是不一定的.
第三题:瞎做等于12,不解释.