81 - 35+30 (55) = 26 therefore 26cm is ur final answer
The best sampling strategy would be a stratified sample.
<h3>How are samples classified?</h3>
Samples may be classified as:
- Convenient: Drawn from a conveniently available pool.
- Random: All the options into a hat and drawn some of them.
- Systematic: Every kth element is taken.
- Cluster: Divides population into groups, called clusters, and each element in the cluster is surveyed.
- Stratified: Also divides the population into groups. Then, a equal proportion of each group is surveyed.
For this problem, the 4 different brands of the recorders must be considered, hence the buyers should be divided into groups, and a proportion of each group should be sampled, hence a stratified sample should be used.
More can be learned about sampling at brainly.com/question/25122507
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Answer:
Step-by-step explanation:
From the question we are told that:
Rate 
Height 
Radius 
Generally the equation for Volume of Cone is mathematically given by
Differentiating
Surface Area of the Prism = (6x4) = 2(5x4) + 2(1/2x6x4)
Surface Area of the Prism = 24 + 40 + 24
Surface Area of the Prism =88 cm²
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Answer: Surface Area of the Prism =88 cm²
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It’s wants 20 characters lol but the answer is b
