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Serhud [2]
2 years ago
5

15 POINTS!!! HELP ASAP! Liz wants to write the phrase “the difference of seven and the number squared” as an algebraic expressio

n. She wrote out several expressions in the table. Which expression correctly represents the phrase.
Expression number ____?

Mathematics
1 answer:
deff fn [24]2 years ago
6 0

Answer:

7-n^2 (#3)

Step-by-step explanation:

"the difference of" means subtract following number from preceding number in this case 7 from an unknown and it wants this number squared therefore 7 - n^2 is your answer

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The ball rolls downhill, its kinetic energy increases and its potential energy ________
lana [24]
Maximum. Hope you get it right!!
6 0
2 years ago
Which of the following is not a property of a chi-square distribution?
laiz [17]

Answer:

c) Is not a property (hence (d) is not either)

Step-by-step explanation:

Remember that the chi square distribution with k degrees of freedom has this formula

\chi_k^2 = \matchal{N}_1^2 +  \matchal{N}_2^2 + ... + \, \matchal{N}_{k-1}^2 +  \matchal{N}_k^2

Where N₁ , N₂m .... N_k are independent random variables with standard normal distribution. Since it is a sum of squares, then the chi square distribution cant take negative values, thus (c) is not true as property. Therefore, (d) cant be true either.

Since the chi square is a sum of squares of a symmetrical random variable, it is skewed to the right (values with big absolute value, either positive or negative, will represent a big weight for the graph that is not compensated with values near 0). This shows that (a) is true

The more degrees of freedom the chi square has, the less skewed to the right it is, up to the point of being almost symmetrical for high values of k. In fact, the Central Limit Theorem states that a chi sqare with n degrees of freedom, with n big, will have a distribution approximate to a Normal distribution, therefore, it is not very skewed for high values of n. As a conclusion, the shape of the distribution changes when the degrees of freedom increase, because the distribution is more symmetrical the higher the degrees of freedom are. Thus, (b) is true.

6 0
3 years ago
Which of the following is equivalent to the inequality shown below?
VARVARA [1.3K]

Answer:

4x + 0.9 \geq 0.1 is equivalent to the inequality 40x+9 \geq 1

Step-by-step explanation:

Given inequality : 4x + 0.9 \geq 0.1

We are supposed to find Which of the following is equivalent to the inequality

4x + 0.9 \geq 0.1

\Rightarrow 4x+\frac{9}{10} \geq \frac{1}{10}

Multiply both sides by 10

\Rightarrow 4(10)x+\frac{9}{10}(10) \geq \frac{1}{10}(10)

\Rightarrow 40x+9 \geq 1

4x + 0.9 \geq 0.1 is equivalent to the inequality 40x+9 \geq 1

So, Option B is true

B) 40x+9 \geq 1

7 0
3 years ago
Write an algebraic expression to represent the phrase the different between two times b & 11
svet-max [94.6K]

are you sure you wrote that right?????

6 0
3 years ago
Tia, Veronica, Pam, and Lily are sisters. Tia is 8 years old and she is 2 years older than Pam. Pam is 5 years younger than Vero
JulijaS [17]

Answer:

Pam 6

Tia 8

Veronica 11

Lily 15

Step-by-step explanation:

Tia's age = 8

Pam's age = Tia's age - 2

8 - 2 = 6

Veronica = pam's age + 5

6 + 5 = 11

Lily's age = veronica's age + 4

11 + 4 = 15

3 0
3 years ago
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