3 years ago

Plz help me fast I really need help

Mathematics

1 answer:

Sergio [31]3 years ago

4 0

I would say that 18 is C, and I don’t know about 19

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How can Help me<br> (a+b)^2≥4ab

sattari [20]

Mark as brainlist___________________________________

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3 years ago

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HELP PLEASE IM FAILING MATH VERY HARD

Arisa [49]

Answer:

Rectangle.

Step-by-step explanation:

I wish I could show you on a picture.

6 0

3 years ago

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The owner of a small store buys coats for 50.00$ each. Answer parts a and b.sells the coats for $ each. he sells the coats for

alukav5142 [94]

Answer:

40% profit

140% markup

Step-by-step explanation:

I'm not sure if it's asking what is the markup, or how much you are making.

But profit

$20 out of 50 = 0.40

Markup

70/50 = 1.4 -> 140% markup

6 0

3 years ago

1/b+x=3b/2x^2 - 1/x<br>btw ^2 means square<br><br>

AlekseyPX

Answer:

$x = \frac{ - 3b}{4} \: or \: b$

Step-by-step explanation:

$\frac{1}{b + x} = \frac{3b}{2 {x}^{2} } - \frac{1}{x}$

$= > \frac{1}{b + x} = \frac{3b - 2x}{2 {x}^{2} }$

$= > 2 {x}^{2} = (b + x)(3b - 2x)$

$= > 2 {x}^{2} = 3 {b}^{2} - 2bx + 3bx - 2 {x}^{2}$

$= > 2 {b}^{2} = 3 {b}^{2} + bx - 2 {x}^{2}$

$= > 3 {b}^{2} + bx - 4 {x}^{2} = 0$

$= > 3 {b}^{2} + 4bx - 3bx - 4 {x}^{2} = 0$

$= > b(3b + 4x) - x(3b + 4x) = 0$

$= > (3b + 4x)(b - x) = 0$

Hence,

$x = \frac{ - 3b}{4} \: or \: b$

8 0

3 years ago

g Suppose we want to know what proportion p of students in a large university have studied calculus in high school. At least how

Soloha48 [4]

Answer:

1067

Step-by-step explanation:

Given that:

Error (E) = 0.03

Confidence interval = 95% = 0.95

Sample size (n) = ((Zα/2) / Error)^2 * p(1 - p)

Since no assumption is given ; p = 0.5

α = 0.95

Z(1-α/2) = 1.96

(1.96 / 0.03)^2 * 0.5(1 - 0.5)

(65.333333)^2 * 0.5(0.5)

4268.4444 * 0.25

= 1067.1111

n = 1067

3 0

3 years ago