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Talja [164]
3 years ago
10

Brainest gets 100 do problem 1-12 show your work

Mathematics
1 answer:
In-s [12.5K]3 years ago
6 0
1. Closed
2. IDK
3. No, because the first inequality says x is lesser than 5 but the second one          says x is greater. X can't be both greater and lesser at the same time.
4. X>12       
5. X\leq -4
6. y<-8
7. 2.3 + w>18
8. -4t\leq -2/5
9. b - 4.2 < -7.5
10. 2x \leq  -24
11. 4 + 8 \leq 12 - Correct
12. 5(-5) > -15 = -25 > -15 = Incorrect
You might be interested in
Can someone please help me with 1 and 2 :)
raketka [301]

Answer:

1. {(2, 7), (1, 3), (0, -5), (-1, -2)}

2. {(1, -1), (-1, 0), (-3, -5), (-9, 2)}

Step-by-step explanation:

Inverse means finding the opposite so basically all you have to do is write the opposite of lets say -3 which is +3.

3 0
3 years ago
Dr. Pagels is a mammalogist who studies meadow and common voles. He frequently traps the moles and has noticed what appears to b
Alina [70]

Answer:

Null hypothesis = H₀ = There food preferences among vole species are independent of one another.

Alternate hypothesis = H₁ = There is a relationship between voles and food preference.

Expected meadow vole/apple slices = 29.983051

Expected common vole/apple slices = 28.016949

Expected meadow vole/peanut butter-oatmeal = 31.016949

Expected common vole/peanut butter-oatmeal = 28.983051

Chi-square value = χ² = 2.154239

Degree of freedom = 1

Critical value = 3.841

χ² < Critical value

We failed to reject H₀

We do not have significant evidence at the given significance level to show that there is a relationship between voles and food preference.

Step-by-step explanation:

He frequently traps the moles and has noticed what appears to be a preference for a peanut butter-oatmeal mixture by the meadow voles vs apple slices are usually used in traps, where the common voles seem to prefer the apple slices.

So he conducted a study where he used a peanut butter-oatmeal mixture in half the traps and the normal apple slices in his remaining traps to see if there was a food preference between the two different voles.

Null hypothesis = H₀ = There food preferences among vole species are independent of one another.

Alternate hypothesis = H₁ = There is a relationship between voles and food preference.

Data collected by Dr. Pagels:

                                              meadow voles     common voles      Row Total

apple slices                                     26                          32                      58

peanut butter-oatmeal                   35                          25                     60

Column Total                                   61                          57                     118

Where 118 is the grand total.

The expected number is given by

Expected = (row total)×(column total)/grand total

Expected meadow vole/apple slices = 58×61/118

Expected meadow vole/apple slices = 29.983051

Expected common vole/apple slices = 58×57/118

Expected common vole/apple slices = 28.016949

Expected meadow vole/peanut butter-oatmeal = 60×61/118

Expected meadow vole/peanut butter-oatmeal = 31.016949

Expected common vole/peanut butter-oatmeal = 60×57/118

Expected common vole/peanut butter-oatmeal = 28.983051

The chi-square statistic value is given by

χ² = Σ(Observed - Expected)²/Expected

χ² = (26 - 29.983051)²/29.983051 + (32 - 28.016949)²/28.016949 + (35 - 31.016949)²/31.016949 + (25 - 28.983051)²/28.983051

χ² = 2.154239

The degrees of freedom is given by

DoF = (row - 1)×(col - 1)

For the given case, we have 2 rows and 2 columns

DoF = (2 - 1)×(2 - 1)

DoF = 1

The given level of significance = 0.05

The critical value from the chi-square table at α = 0.05 and DoF = 1 is found to be

Critical value = 3.841

Conclusion:

Reject H₀ If χ² > Critical value

We reject the Null hypothesis If the calculated chi-square value is more than the critical value.

For the given case,

χ² < Critical value

We failed to reject H₀

We do not have significant evidence at the given significance level to show that there is a relationship between voles and food preference.

8 0
3 years ago
if the balance at the end of eight years on an investment of $630 that has been invested at a rate of 9% is $1083.60, how much w
Zielflug [23.3K]

Answer: The interest is $453.60.

The total amount includes principal + interest. The principal was 630 and the total amount was 1083.60.

1083.60 - 630 = 453.60.

Step-by-step explanation:

8 0
3 years ago
Minimum point of the quadratic x^2+6x-2
WITCHER [35]

Answer:

(-3,-11)

Step-by-step explanation:

Compare the given quadratic equation with the general quadratic equation.

a=1, b=6 and c=-2

x=-\dfrac{(6)}{2(1)}\\=-3

Subsitute -3 for x in given quadratic equation.

y=(-3)^2+6(-3)-2\\=9-18-2\\=-11

The minimum point is (-3,-11).

3 0
2 years ago
Is y = 0 the asymptote of all functions of the form f(x) = ab^x? Explain your reasoning.
xeze [42]
Y=0 would be a horizontal line.  An asymptote is a line that a function approaches, but never reaches.  Exponential functions such as these are a smooth curve.  If both numbers are positive numbers greater than or equal to 1, the curve increases.  If at least one of the numbers is a positive number between 0 and 1, the curve decreases.  If <em>a</em> is a negative number, the curve decreases as well.  If either <em>a</em> or <em>b</em> is zero, then the graph would stay constant at 0.  However, as long as neither <em>a</em> nor <em>b</em> is zero, then this graph will never touch that point.  The only way to get an answer of y=0 is to multiply by 0.  If neither <em>a</em> nor <em>b</em> is zero, this won't happen.
6 0
3 years ago
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