coexpennan
2020-12-02
Answered

On her first three quizzes Jenna averaged 8 correct answers. On the next two quizzes she averaged 9 correct answers. What decimal number shows Jenna's average score on all five quizzes?

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jlo2niT

Answered 2020-12-03
Author has **96** answers

Let a, b, and c be her scores on the first three quizzes and dd and ee be her scores on the next two quizzes. Since she scored an average of 8 correct answers on her first three quizzes, then: average=(sum of first three quiz scores/3 quizzes)

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b. $\{x\in R\mid x\le 0{\textstyle \phantom{\rule{1em}{0ex}}}\text{or}{\textstyle \phantom{\rule{1em}{0ex}}}x\Rightarrow 1\}$

c. $\{n\in Z\mid n\text{}is\text{}a\text{}factor\text{}of\text{}6\}$

d. $\{n\in Z\cdot \mid n\text{}is\text{}a\text{}factor\text{}of\text{}6\}$

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I am at a complete loss as to where to even start this mathproblem.

102 2/5 - 43 3/4

The only thing I get is that I'm to subtract the whole numbersfirst. After that I am completely stumped as to what comes next. Itried finding the least common denominator for 4 and 5, but I couldonly come up with the number 1 for both of them. If anyone couldhelp explain the general idea of where to go from here, I wouldtruly appreciate it! Thank you!

102 2/5 - 43 3/4

The only thing I get is that I'm to subtract the whole numbersfirst. After that I am completely stumped as to what comes next. Itried finding the least common denominator for 4 and 5, but I couldonly come up with the number 1 for both of them. If anyone couldhelp explain the general idea of where to go from here, I wouldtruly appreciate it! Thank you!

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Then is it correct to say that the sum of the circumference of all the circles is the surface area of the sphere? (Please describe why not)

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Then is it correct to say that the sum of the circumference of all the circles is the surface area of the sphere? (Please describe why not)

${S}_{sphere}=2\sum _{h=0}^{r}2\sqrt{{r}^{2}-{h}^{2}}\pi $ (Where $\sqrt{{r}^{2}-{h}^{2}}$ is radius in each circle with distance h to center, Also multiplied by 2 because it's sum of circles in semisphere)Thanks in advance.

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