3 years ago

Need help please please

Mathematics

1 answer:

masya89 [10]3 years ago

4 0

Answer:

A No

B Yes

C No

D No

Step-by-step explanation:

y = x + 8 is the only linear function. Its graph is a straight line.

The others are not linear. Their graphs are curved

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In the diagram, the areas of and are in a ratio of 3 : 4. What are the coordinates of point C?

Radda [10]

9514 1404 393

Answer:

D. (4, -6)

Step-by-step explanation:

Since the heights of both triangles are the same (CD), their areas are proportional to their bases. That is ...

AC : CB = 3 : 4

In terms of coordinates, ...

4(C -A) = 3(B -C) . . . . multiply the ratios by 4(CB)

4C -4A = 3B -3C . . . .simplify

7C = 4A +3B . . . . . . . isolate C

C = (4A +3B)/7 . . . . . divide by 7

C = (4(1, -9) +3(8, -2))/7 = (28, -42)/7 . . . . substitute given coordinates

C = (4, -6)

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3 years ago

Scores on an English test are normally distributed with a mean of 31.5 and a standard deviation of 7.3. Find the score that sepa

vladimir1956 [14]

If $X$ is a random variable representing test scores, then the 41st percentile is the score $x$ such that $P(X\le x)=0.41$ . Transform $X$ to the random variable $Z$ that follows the standard normal distribution via $X=31.5+7.3Z$ :

$P(X\le x)=P\left(\dfrac{X-31.5}{7.3}\le\dfrac{x-31.5}{7.3}\right)=P\left(Z\le\dfrac{x-31.5}{7.3}\right)=0.41$

The $z$ -score for the 41st percentile is about -0.2275, so

$\dfrac{x-31.5}{7.3}\approx-0.2275\implies\boxed{x\approx29.8}$

6 0

4 years ago

Need help ASAP please and thank you

likoan [24]

Answer:

The answer is C

$\frac{4 \times - 4 - 4}{ - 4 - 1}$

$\frac{ - 16 - 4}{ - 5}$

$\frac{ - 20}{ - 5} = 4$

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3 years ago

Substitution<br> 7. 4x+y=3.4 <br> x=4y

Ivanshal [37]

Here is how i solved it hope it helps

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3 years ago

The average (arithmetic mean) of 5 numbers is 13. if the average of 4 of these numbers is 10, what is the fifth number?

choli [55]

The fifth number is 25

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3 years ago