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3 years ago

Which inequality is true when X = -8?

Mathematics

1 answer:

alexgriva [62]3 years ago

4 0

Answer:

<u>2</u>

Remember:

+ and - = -

- and + = -

- and - = +

+ and + = +

1. -4 +(-8) > 20

-4 - 8 > 20

-12 > 20? Incorrect

2. -7 - 4(-8) < 27

-7 + 32 < 27

25 < 27? Correct

3. 8 + 3(-8) > -10

8 - 24 > -10

-16 > -10? Incorrect

4. 5 - 2(-8) < 15

5 + 16 < 15

21 < 15?, Incorrect

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3 years ago

Indicate the equation of the line, in standard form, that passes through (2, -4) and has a slope of 3/5. Enter your answer into

ANEK [815]

Answer:

-3/5x + y = - 26/5

Step-by-step explanation:

First, I put everything in slope-intercept form, just because it's more simple for me.

y = 3/5x + b

Since we don't have b, we can use the coordinate they give us to solve for it.

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y = 3/5x - 26/5

Now, we can move the variables around to fit the form:

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I hope this helped!

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3 years ago

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3 years ago

1. Scientific Notation and Percent. (Based on the ideas in Objective 1 and Objective 4.) 6 points

vlabodo [156]

Answer: $1.715*10^{12}$ skin cells were not burned.

Step-by-step explanation:

<h3><u> The complete exercise is: Two percent of Sennie's skin cells were burned when she escaped from a fire. If $3.5*10^{10}$ of her skin cells were burned then, how many skin cells were not burned?</u></h3><h3 />

Let be "x" the number of Sennie's skin cells that were not burned when she escaped from the fire.

According the the data given in the exercise, you know that 2% represents $3.5*10^{10}$ of Sennie's skin cells that were burned. This means that the percent of her skin cells that were not burned is:

$100\%-2\%=98\%$

With this information you can write the following proportion:

$\frac{3.5*10^{10}}{2}=\frac{x}{98}$

Solving for "x", you get:

$(98)(\frac{3.5*10^{10}}{2})=x\\\\x=171.5*10^{10}$

To express the result in Scientific notation, the decimal point must be after the first digit; then you must move the decimal point two places to the left:

$x=1.715*10^{12}$

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4 years ago