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aniked [119]
3 years ago
15

Which shows the correct first step to solving the system of equations in the most efficient manner? 3 x + 2 y = 17. x + 4 y = 19

.
x = negative 4 y + 19
x = StartFraction negative 2 y + 17 Over 3 EndFraction 4
y = negative x + 19
y = StartFraction negative 3 x + 17 Over 2 EndFraction
Mathematics
2 answers:
Anton [14]3 years ago
5 0

Answer:

a.)x = negative 4 y + 19

Step-by-step explanation:

i got it right on e2020 lol

djyliett [7]3 years ago
4 0

Answer: The Answer is a

Step-by-step explanation:

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Komok [63]

Answer:

11

Step-by-step explanation:

5 0
2 years ago
A study is done by a community group in two neighboring colleges to determine which one graduates students with more math classe
stealth61 [152]

Answer:

t=\frac{(4-3.5)-0}{\sqrt{\frac{1.5^2}{11}+\frac{1^2}{9}}}}=0.890  

The p value for this case would be:

p_v =P(t_{18}>0.890)=0.193  

The p value is higher than the significance level so then we can conclude that we can FAIL to reject the null hypothesis and then the true mean for group A is not significantly higher than the mean for B

Step-by-step explanation:

Information given

\bar X_{1}=4 represent the mean for sample A

\bar X_{2}=3.5 represent the mean for sample B

s_{1}=1.5 represent the sample standard deviation for A

s_{2}=1 represent the sample standard deviation for B  

n_{1}=11 sample size for the group A

n_{2}=9 sample size for the group B  

\alpha=0.1 Significance level provided

t would represent the statistic

Hypothesis to test

We want to verify if the student who graduates from college A has taken more math classes, on the average, the system of hypothesis would be:  

Null hypothesis:\mu_{1}-\mu_{2} \leq 0  

Alternative hypothesis:\mu_{1} - \mu_{2}> 0  

The statistic is given by:

t=\frac{(\bar X_{1}-\bar X_{2})-\Delta}{\sqrt{\frac{s^2_{1}}{n_{1}}+\frac{s^2_{2}}{n_{2}}}} (1)  

And the degrees of freedom are given by df=n_1 +n_2 -2=11+9-2=18  

Replacing we got:

t=\frac{(4-3.5)-0}{\sqrt{\frac{1.5^2}{11}+\frac{1^2}{9}}}}=0.890  

The p value for this case would be:

p_v =P(t_{18}>0.890)=0.193  

The p value is higher than the significance level so then we can conclude that we can FAIL to reject the null hypothesis and then the true mean for group A is not significantly higher than the mean for B

5 0
3 years ago
Equation of a line with a slope of -3 that passes through point (6,9)?
Serjik [45]

Answer:

<u>Point-slope form: y-9 = -3(x - 6)</u>

<u>Standard form: y = -3x+27</u>

Step-by-step explanation:

The point-slope form equation is y - y1 = m(x - x1). Because we are trying to find the equation that passes through (6,9), use these values as x1 and y1. In this equation m is the slope and we are also given that the slope is -3. This means that the equation in point-slope form is y-9 = -3(x - 6).

If it is asked for the equation in standard form, some simple moving of terms can accomplish that. Multiply out the -3 and get y-9 = -3x + 18. Add 9 to both sides to get a final answer of y = -3x+27.

7 0
3 years ago
Fifty shares of Mega Stock cost $212.50. How many shares can you buy with $850?
Ainat [17]

Answer:

25

Step-by-step explanation:

5 0
2 years ago
(9-7)^3 . 5^0 + (8+3)^2
labwork [276]
After solving, you response should be "122", remember PEMDAS, always do parentheses!
4 0
3 years ago
Read 2 more answers
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