11. The surface area of a triangular prism is 78 square inches. What is
1 answer:
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Answer:
-12x+18x²
Step-by-step explanation:
Given:
Distributive property of multiplication under which a number is multiplied by the sum of two number, the first number can be distributed to both of those number.
∴
solving it by using distributive property
=
=
Opening parenthesis
=
Hence, -12x+18 is the result after using distributive property.
Answer:
The 95% of confidence interval for the mean penetration resistance for this soil is (2.0823, 3.1977).
Step-by-step explanation:
The sample size is 15.
The first step to solve this problem is finding how many degrees of freedom there are, that is, the sample size subtracted by 1. So
Then, we need to subtract one by the confidence level and divide by 2. So:
Now, we need our answers from both steps above to find a value T in the t-distribution table. So, with 14 and 0.025 in the t-distribution table, we have .
Now, we need to find the standard deviation of the sample. That is:
Now, we multiply T and s
For the lower end of the interval, we subtract the mean by M. So 2.64 - 0.5577 = 2.0823
For the upper end of the interval, we add the mean to M. So 2.64 + 0.5577 = 3.1977
The 95% of confidence interval for the mean penetration resistance for this soil is (2.0823, 3.1977).