3 years ago

Solve the system by substitution. y = -3x +4 y = 2

Mathematics

1 answer:

erma4kov [3.2K]3 years ago

5 0

Answer:

(2/3,2)

Step-by-step explanation:

3*2/3+4

simplify 2=2

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Which expression shows how 6 • 45 can be rewritten using the distributive property?. A. 6 • 40 + 6. B. 6 • 4 + 6 • 5. C. 6 • 40

svlad2 [7]

6*45 = 6*(40 + 5) = 6*40 + 6*5

Option C.

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3 years ago

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a carnival charges $8.50 per ticket for adults and $4.50 per ticket for children. which expression represents the total price a

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The answer is D <span>8.5x + 4.5y</span>

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3 years ago

what dose a point represents: a) line segment b) a location c) intersection of a plane d) none of the above

meriva

Answer:

(B) A location

Step-by-step explanation:

If you have a point on a graph or number line, it always represents a certain location on the graph.

For instance, if we have a point on the x=3 line and the y=4 line, the point would represent the location (3,4).

Hope this helped!

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3 years ago

The water diet requires you to drink two cups of water every half hour from the time you get up until you go to bed, but otherwi

Elan Coil [88]

Answer:

$7-3.182 \frac{13.638}{\sqrt{4}}= -14.698$

$7+3.182 \frac{13.638}{\sqrt{4}}= 28.698$

Step-by-step explanation:

For this case we have the following info given:

Weight before diet 180 125 240 150

Weight after diet 170 130 215 152

We define the random variable $D = before-after$ and we can calculate the inidividual values:

D: 10, -5, 25, -2

And we can calculate the mean with this formula:

$\bar X= \frac{\sum_{i=1}^n X_i}{n}$

And the deviation with:

$s= \sqrt{\frac{\sum_{i=1}^n (X_i- \bar X)^2}{n-1}}$

And after replace we got:

$\bar D= 7, s_d = 13.638$

And the confidence interval for this case would be given by:

$\bar D \pm t_{\alpha/2} \frac{s_d}{\sqrt{n}}$

The degrees of freedom are given by:

$df = n-1= 4-1=3$

For the 95% of confidence the value for the significance is $\alpha=0.05$ and the critical value would be $t_{\alpha/2}= 3.182$ . And replacing we got:

$7-3.182 \frac{13.638}{\sqrt{4}}= -14.698$

$7+3.182 \frac{13.638}{\sqrt{4}}= 28.698$

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3 years ago

If a basketball court is 94 feet long and 50 feet wide, what is the area of a basketball court?

OLEGan [10]

94 x 50 = 4700 square feet

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3 years ago

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