Basically that answer is incorrect. If you'd learn about combining, multiplying, dividing or subtracting like terms, this will be a simple problem. To be specific, like term is a number with a letter with it.
For example, 2.4z is a like term.
so you can only add like term, not any other normal number. When two terms have the same "letter", you will have to do what the sign said so in the problem....
2.4z + 1.2z - 6.5 = 0.7
3.6z - 6.5 = 0.7 (Add but leave the z alone because you are not multiplying)
The final answer is 3.6z - 6.5 because you cannot do anything else to that problem.
3.6z-6.5=0.7 is not true.
382 - 4 = 378
378/9 = 42
so there are 42 students on each bus
Answer: 7n−13
Step-by-step explanation:
<span>A medical researcher wants to investigate the amount of time it takes for patients' headache pain to be relieved after taking a new prescription painkiller. She plans to use statistical methods to estimate the mean of the population of relief times. She believes that the population is normally distributed with a standard deviation of 18 minutes. How large a sample should she take to estimate the mean time to within 4 minutes with 97% confidence?
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n = [z*s/E]^2
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n = [2.17*18/4]^2 = 96 when rounded up
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