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2 years ago

What is the missing polynomial ?-(20-4x5x^2)=20-7x^2

Mathematics

1 answer:

dybincka [34]2 years ago

3 0

Answer: $-2x^2-4x+40$

Step-by-step explanation:

Suppose the missing polynomial be f(x)

So, we can write

$\Rightarrow f(x)-(20-4x+5x^2)=20-7x^2\\\Rightarrow f(x)=20-7x^2+(20-4x+5x^2)\\\Rightarrow f(x)=-2x^2-4x+40$

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Identify the linear graph.

jenyasd209 [6]

The answer is: The second one. Why?

Because, when it's a linear graph, the slope of the graph cannot change.

And that's the only graph that fits the criteria

Hope this helped! c:

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2 years ago

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In a recent year, a sample of grade 8 Washington State public school students taking a mathematics assessment test had a mean sc

Daniel [21]

Answer:

The number is $N =1147$ students

Step-by-step explanation:

From the question we are told that

The population mean is $\mu = 281$

The standard deviation is $\sigma = 34.4$

The sample size is n = 2000

percentage of the would you expect to have a score between 250 and 305 is mathematically represented as

$P(250 < X < 305 ) = P(\frac{ 250 - 281}{34.4 } < \frac{X - \mu }{\sigma } < \frac{ 305 - 281}{34.4 } )$

Generally

$\frac{X - \mu }{\sigma } = Z (Standardized \ value \ of \ X )$

$P(250 < X < 305 ) = P(-0.9012< Z$

$P(250 < X < 305 ) = P(z_2 < 0.698 ) - P(z_1 < -0.9012)$

From the z table the value of $P( z_2 < 0.698) = 0.75741$

and $P(z_1 < -0.9012) = 0.18374$

$P(250 < X < 305 ) = 0.75741 - 0.18374$

$P(250 < X < 305 ) = 0.57$

The percentage is $P(250 < X < 305 ) = 57\%$

The number of students that will get this score is

$N = 2000 * 0.57$

$N =1147$

6 0

3 years ago

Mr. Allen spent $40 for 6 movies. If each movie is the same price, how much would he have to spend for 24 movies?

ser-zykov [4K]

Answer:

about $160

Step-by-step explanation:

$ 40/ for 6 movies = $6.66/movie

$6.66/movie x 24 movies = about $160

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2 years ago

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Help this answer is confusing.

lbvjy [14]

Answer:

it's the first one 49.96÷5

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2 years ago

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7 × (–3) × (–2)2 = ? A. 84 B. 48 C. –84 D. –48

Dahasolnce [82]

7 × (-3) ×(-2)2 =

7 × -3 × -4 = (you have to eliminate all parenthesis in the equation.)

7 × -12 = -84

so your answer would be: C

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3 years ago

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