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3 years ago

Please help, our teacher wasn’t here and we got no explanation on how to do it

Mathematics

2 answers:

nasty-shy [4]3 years ago

8 0

Help with what? there isn’t anything there

Assoli18 [71]3 years ago

5 0

Is there a question or you need an explanation on something? :)

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Factor the perfect-square trinomial in y = (x2 + 2x + 1) − 1− 1.<br> y = (x + <br> )2 − 1 −1

dolphi86 [110]

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$y = ( {x}^{2} + 2x + 1) - 1$

$y = ({x + 1})^{2} - 1$

$y = ({x + 1})^{2} - ({1})^{2}$

We're done now but I have something to tell...

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Hint :

${a}^{2} - {b}^{2} = (a + b)(a - b)$

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$y = ( \: (x + 1) + 1)( \: (x + 1) - 1) \\$

$y = (x + 2)(x)$

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4 0

3 years ago

Read 2 more answers

Please help me on this least to greatest

tester [92]

The third option is the answer

5 0

3 years ago

The volume of a cylinder with height h and radius r is given by the formula below.

Luba_88 [7]

Answer:

V = pi r^2h

V/pi = r^2 h

V/pir^2 = h

5 0

3 years ago

A certain standardized test's math scores have a bell-shaped distribution with a mean of 530 and a standard deviation of 119. Co

kumpel [21]

Answer:

a) 68.2%

b) 31.8%

c) 2.3%

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 530

Standard Deviation, σ = 119

We are given that the distribution of math scores is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

a) P(test scores is between 411 and 649)

$P(411 \leq x \leq 649)\\\\= P(\displaystyle\frac{411 - 530}{119} \leq z \leq \displaystyle\frac{649-530}{119})\\\\= P(-1 \leq z \leq 1)\\\\= P(z \leq 1) - P(z < -1)\\= 0.841 - 0.159 = 0.682 = 68.2\%$

b) P(scores is less than 411 or greater than 649)

$P(x < 411 < x, x > 649)\\=1 = P(411 \leq x \leq 649)\\=1 - 0.682\\=0.318 = 31.8\%$

c) P(score greater than 768)

P(x > 768)

$P( x > 768) = P( z > \displaystyle\frac{768 - 530}{119}) = P(z > 2)$

$= 1 - P(z \leq 2)$

Calculation the value from standard normal z table, we have,

$P(x > 768) = 1 -0.977 = 0.023 = 2.3\%$

5 0

4 years ago

The expression −8x3(7x6 − 3x5) is equivalent to?

Mama L [17]

Answer:

-56x^9+24x^8

Step-by-step explanation:

3 0

4 years ago