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3 years ago

This is a really easy question Just need to make sure it is right. Is it B

Mathematics

2 answers:

sergij07 [2.7K]3 years ago

5 0

Your right the answers b

slamgirl [31]3 years ago

4 0

Yea .........., the answer is B.

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12g+6=78 thats what i need help with

Mrrafil [7]

I assume you need to solve for g?
12g + 6 = 78
- 6
12g = 72
÷ 12
g = 6
I hope this helps! Let me know if you want me to explain anything :)

4 0

3 years ago

Read 2 more answers

What is the equation of a hyperbola with a = 5 and c = 15? Assume that the transverse axis is horizontal.

gogolik [260]

Answer:

$\frac{x^2}{25} -\frac{y^2}{200} =1$

Step-by-step explanation:

Recall that the equation of hyperbola centered at the origin with transverse horizontal axis has the general form:

$\frac{x^2}{a^2} -\frac{y^2}{b^2} =1\\and\,\,\,\, with\\c=\sqrt{a^2+b^2}$

since we know that a = 5 ,and c = 15,we can solve for b:

$15=\sqrt{5^2+b^2} \\15^2=25+b^2\\b^2=200\\$

then the equation of the hyperbola becomes:

$\frac{x^2}{5^2} -\frac{y^2}{200} =1\\\frac{x^2}{25} -\frac{y^2}{200} =1$

6 0

3 years ago

6. In a jar of 650 marbles, 20% of the marbles are red. How many marbles are not red

Degger [83]

Answer:

Step-by-step explanation:

20% of 650

1/5 of 650

130=red

520= not red

6 0

3 years ago

Read 2 more answers

I GIVEEEE BRAINLILSTT

Olegator [25]

Answer:

ok can i have the brain lets know or when do i get them?

Step-by-step explanation:

1 2 3 45 67 7 8 8 90 0 - 93574756907490 +++++++ .//../2823rg778gq 10900

1000000000000000 :) great JOB u MAD IT

5 0

3 years ago

Read 2 more answers

Taking a test i don’t know anything about please help

PilotLPTM [1.2K]

Answer:

See below for answers and explanations

Step-by-step explanation:

Problem 4:

The line of regression is $\hat y = a+bx$ where:

$a=\overline y-b \overline x$

$b=\frac{r*s_y}{s_x}$

We are given that $\overline y=75$ , $s_y=8$ , $\overline x=280$ , $s_x=30$ , and $r=0.60$ , therefore our slope, $b$ , is:

$b=\frac{r*s_y}{s_x}$

$b=\frac{(0.60)(8)}{30}$

$b=0.16$

Therefore, the slope of the regression line is 0.16, which can be used along with the values of $\overline y$ and $\overline x$ to find the constant $a$ :

$a=\overline y-b \overline x$

$a=75-(0.16)(280)$

$a=30.2$

This means our final regression line is $\hat y = 30.2 + 0.16x$

Problem 5:

The slope, $b=0.16$ , means that for every 1 point earned for a student's pre-exam total, their final exam score will increase by 0.16 points for each point they earned on the pre-exam.

Problem 6:

The y-intercept (or constant), $a=30.2$ , means that if a student's pre-exam total were 0, then they would expect to get a 30.2 on the final exam.

Problem 7:

$R^{2}=(0.60)^{2}=0.36=36\%$

Problem 8:

The fraction of variability (aka. coefficient of determination), $R^2$ , means that a certain proportion (or percentage) of the variance in the response variable can be explained by the explanatory variable. In context, this means that 36% of the variance in final exam scores can be explained by the pre-exam scores.

6 0

3 years ago