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lord [1]
3 years ago
9

Nora and Eli are making homemade spring

Mathematics
1 answer:
yawa3891 [41]3 years ago
3 0

Answer:

eli

Step-by-step explanation:

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The speed of sound is 1236km/h. how many kilometers per minute is it​
gtnhenbr [62]
20.6 kilometers, i think.
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Lupe uses 7.8 pints of white paint and blue paint to paint her bedroom walls. 3 4 of this amount is white paint, and the rest is
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41.8 pints or 11.2 pints
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Which is an equation of the line that passes through (–1, –5) and (–3, –7)?
nadya68 [22]

For this case we have that by definition, an equation of the line of the slope-intersection form is given by:

y = mx + b

Where:

m: It's the slope

b: It is the cut-off point with the y axis

We have two points through which the line passes, then we find the slope:

(x1, y1): (- 1, -5)\\(x2, y2): (- 3, -7)

m = \frac {y2-y1} {x2-x1} = \frac {-7 - (- 5)} {- 3 - (- 1)} = \frac {-7 + 5} {- 3 + 1} = \frac {-2} {- 2} = 1

Then, the equation is of the form:

y = x + b

We substitute a point and find b:-5 = -1 + b\\-5 + 1 = b\\b = -4

Finally we have:

y = x-4

Answer:

Option B

3 0
3 years ago
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A publishing company claims that in fall 2019, the average price of college textbooks for a single semester is $385. Suppose you
hram777 [196]

Answer:

We accept H₀ . We don´t have enough evidence to express the publisher claim is not true

Step by Step explanation:

We must evaluate if the mean of the price of college textbooks is different from the value claimed by the publisher

n < 30 then we must use t - distrbution

degree of freedom   n  - 1     df = 22 - 1     df = 21

As the question mentions " different " that means,  a two-tail test

At 0,01 significance level     α  = 0,01       α/2  =  0,005

and t(c)  = 2,831

Test Hypothesis

Null Hypothesis                      H₀          μ  =  μ₀

Alternative hypothesis           Hₐ          μ  ≠  μ₀

To calculate t(s)

t(s)  =  (  μ  -  μ₀ ) /σ/√n

t(s)  =  (  433,50 - 385 ) / 86,92 / √22

t(s)  =  2,6171

Comparing   t(c)   and t(s)

t(s) < t(c)

Then  t(s) is in the acceptance region we accept H₀. We don´t have enough evidence to claim that mean price differs from publisher claim

6 0
3 years ago
Classify the expression: 5x + 3x^2 − 7x^3 + 2
AysviL [449]

Answer:

C. Cubic expression.

Step-by-step explanation:

The highest exponent is 3 ( in the term 7x^3) so it is cubic.

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