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3 years ago

I NEED THIS DONE A.S.A.P. 50 POINTS!!!!!!

Mathematics

2 answers:

jarptica [38.1K]3 years ago

7 0

I was going to say the same thing but that right

MakcuM [25]3 years ago

5 0

Y+4=-3(X+1)
Point slope form can be written as
Y-k=M(X-p)
Where k is a Y value on the graph, and p is a x value on the graph and M is the slope. Note that p and k must be on the same point I.E (p,k)

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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

5. Dedra is making headbands to sell to her friends. Each headband requires 1 feet of fabric. If Dedra plans to make 14 headband

ZanzabumX [31]

Answer:

14 feet of fabric

Step-by-step explanation:

3 0

3 years ago

What is 4,876,213 rounded to the nearest ten thousand

Nutka1998 [239]

4,880,000

hope that helps!!

4 0

4 years ago

9/10 and -9/10 determine if parallel, perpendicular, or neither

irakobra [83]

Parallel means the slopes are the same
Perpendicular means they have opposite reciprocal slopes.

We can apply these concepts to this question. Although they are opposites of each other, they are not reciprocals.

So, the answer is neither

Hope this helps!

7 0

3 years ago

Francesca has 63 cm of ribbon. She will cut it into two pieces so that the longer piece is 15 cm longer than the shorter piece.

stiks02 [169]

Of you find a wrong thing on answer reply me

5 0

3 years ago