Your answer is 5.499.
Hope you do well on whatever it is, and glad I could help :)
The answer is 28 $ ok I think that
H0: μ = 8
H1: μ > 8
t = (8.25 - 8)/(0.8/sqrt(28)) = 1.654
t_table = 1.703
since t_calc < t_table, we accept H0, and conclude that the sample does not provide cnvincing evidence that the fertilizer had a positive impact on the weight of the corn ears at 0.05 level of significant.
In the secant secant theorem,
AP × BP = CP × DP
AP × 6 = 7 × 12
AP = 7 × 2 = 14
Answer: 14