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3 years ago

Please help!

Mathematics

1 answer:

IceJOKER [234]3 years ago

3 0

I think it’s B. But if it’s not chose D

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(ab - 9)(ab + 8) Please answer.

WINSTONCH [101]

$\text{Use FOIL method:}\ (a+b)(c+d)=ac+ad+bc+bd\\\\(ab-9)(ab+8)=(ab)(ab)+(ab)(8)+(-9)(ab)+(-9)(8)\\\\=a^2b^2+8ab-9ab-72\\\\=\boxed{a^2b^2-ab-72}$

3 0

3 years ago

Put the following equation of a line into slope-intercept form, simplifying all fractions. y - 3x = -1

Archy [21]

Answer:

y=3x-1

Step-by-step explanation:

y-3x=-1

y-3x+3x=-1+3x

y=3x-1

7 0

2 years ago

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The average credit card debt for American is between $11,000 and $17,000. How could this be written using a margin of error

Alexandra [31]

Answer:

[μ-error, μ + error]

[14000- 3000, 14000 + 3000]

Step-by-step explanation:

We write it how an interval, where the center of the interval is the mean, thus

[μ-error, μ + error]

First we calculate the mean

μ = (11000+17000)/2

μ = $14000

And the error is the absolute value of the difference between the mean an either extreme values

error = |14000 -17000| = |14000 - 11000| = 3000

Then

[14000- 3000, 14000 + 3000]

5 0

3 years ago

8th Grade Math Inequalities- A country's mint has a rule that the weight of a certain coin must be within 0.002 gram of 3.00 gra

devlian [24]

We have been given that a country's mint has a rule that the weight of a certain coin must be within 0.002 gram of 3.00 grams to be released into circulation.

Upon expressing this information on an inequality, we get the diagram as shown in the attached file.

We can express it as an inequality as shown below:

$\left | x-3 \right |\leq 0.002$

where x represents the weight of a coin that the country's mint will allow to be released into circulation.

Upon solving this inequality, we get:

$\left | x-3 \right |\leq 0.002\\\-0.002\leq x-3\leq 0.002\\3-0.002\leq x\leq 3+0.002\\2.998\leq x\leq 3.002\\$

Therefore, least weight of a coin is 2.998 and greatest weight of coin is 3.002.

7 0

4 years ago

carbon-14 is an element that loses about 10% of its mass every millennium (i.e., 1000 years). A sample of carbon-14 has 600 gram

ivann1987 [24]

Answer:

1000-100(T)

Step-by-step explanation:

1000

-1000 for each millennia

7 0

3 years ago

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