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3 years ago

Please do all four, thanks :) I'm feeling generous today 40 points

Mathematics

2 answers:

MrMuchimi3 years ago

8 0

Step-by-step explanation:

A. x^2-9x+18

B. x^2-8x+16

C. 2x^2-5x-12

D. 12x^2-31x+7

Lady bird [3.3K]3 years ago

5 0

Answer:

I answered my own brainly question :)

Step-by-step explanation:

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The area model shows 3 1/4 what is 3 Times 3 1/4

Aneli [31]

Answer:

Concept: Basic Multiplication

You have 3 1/4 which can be said in decimal form to be 3.25
You multiply it by 3 to get 9.75 or 9 3/4
Hence D
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3 years ago

Does y=2x-4 represent a linear function?

Tanya [424]

Answer:

Yes

Step-by-step explanation:

This equation is in slope-intercept form, $y=mx+b$ . If graphed, it would be a line.

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3 years ago

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It is generally believed that the mean value of the district's total SAT score distribution is equal to 1200 (the null hypothesi

g100num [7]

Answer:

The corresponding p-value, is p = 1

Step-by-step explanation:

The maximum score SAT score, n = 1,600

The mean of the district's total SAT score distribution = 1,200

The claim of one of the districts principal, is the that mean of the district's total SAT score distribution ≠ 1,200

Using proportions, we have;

p = 1,200/1,600 = 0.75

q = 1 - p = 0.25

The margin of error, E = Z√(p·q/n)

∴ E = 5% = Z×√((0.75 × 0.25)/1,600)

z = 0.05/(√((0.75 × 0.25)/1,600)) ≈ 4.61880

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3 years ago

4 times the measure of the complement of an angle is equal to / the measure of the original angle's supplement. What is the meas

WINSTONCH [101]

72 degrees if its 2/3

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3 years ago

Write a polynomial equation with roots 5 and -9i. X^3-?x^2+?X-?=0

jek_recluse [69]

Answer:

x³ - 5x² + 81x - 405 = 0

Step-by-step explanation:

Complex roots occur in conjugate pairs.

Thus given x = - 9i is a root then x = 9i is also a root

The factors are then (x - 5), (x - 9i) and (x + 9i)

The polynomial is the the product of the roots, that is

f(x) = (x - 5)(x - 9i)(x + 9i) ← expand the complex factors

= (x - 5)(x² - 81i²) → note i² = - 1

= (x - 5)(x² + 81) ← distribute

= x³ + 81x - 5x² - 405, thus

x³ - 5x² + 81x - 405 = 0 ← is the polynomial equation

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3 years ago

Please do all four, thanks :) I'm feeling generous today *40 points*

Please do all four, thanks :) I'm feeling generous today 40 points