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barxatty [35]
3 years ago
9

HELP ASAP WILL GIVE BRAINLIEST. Choose the correct simplification of (3x3 + 2x2 − 5x) − (8x3 − 2x2) please show me the steps!

Mathematics
2 answers:
Romashka [77]3 years ago
6 0
Distribute the Negative Sign:<span>=<span><span><span><span>3<span>x3</span></span>+<span>2<span>x2</span></span></span>−<span>5x</span></span>+<span><span>−1</span><span>(<span><span>8<span>x3</span></span>−<span>2<span>x2</span></span></span>)</span></span></span></span><span>=<span><span><span><span><span><span>3<span>x3</span></span>+<span>2<span>x2</span></span></span>+</span>−<span>5x</span></span>+<span><span>−1</span><span>(<span>8<span>x3</span></span>)</span></span></span>+<span><span>−1</span><span>(<span>−<span>2<span>x2</span></span></span>)</span></span></span></span><span>=<span><span><span><span><span><span><span>3<span>x3</span></span>+<span>2<span>x2</span></span></span>+</span>−<span>5x</span></span>+</span>−<span>8<span>x3</span></span></span>+<span>2<span>x2</span></span></span></span>Combine Like Terms:<span>=<span><span><span><span><span>3<span>x3</span></span>+<span>2<span>x2</span></span></span>+<span>−<span>5x</span></span></span>+<span>−<span>8<span>x3</span></span></span></span>+<span>2<span>x2</span></span></span></span><span>=<span><span><span>(<span><span>3<span>x3</span></span>+<span>−<span>8<span>x3</span></span></span></span>)</span>+<span>(<span><span>2<span>x2</span></span>+<span>2<span>x2</span></span></span>)</span></span>+<span>(<span>−<span>5x</span></span>)</span></span></span><span>=<span><span><span>−<span>5<span>x3</span></span></span>+<span>4<span>x2</span></span></span>+<span>−<span>5x</span></span></span></span>Answer:<span>=<span><span><span>−<span>5<span>x3</span></span></span>+<span>4<span>x2</span></span></span>−<span>5<span>x</span></span></span></span>
TiliK225 [7]3 years ago
3 0
9+4           13-5x-20   i believe this is the answer
                                                   

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A country will produce 3000 missiles this year. Each of the short-range missiles cost $200000 to produce. Each of the medium-ran
Lynna [10]

Answer:

$350,000

Step-by-step explanation:

Let's define:

  • s: amount of short-range missiles produced
  • m: amount of medium-range missiles produced
  • l: amount of long-range missiles produced

From the total production and the ratios we can write the following equations:

s + m + l = 3000

s/m = 3/3 = 1 = m/s

s/l = 3/4 or l/s = 4/3

Dividing the first equation by s, we get:

s/s + m/s + l/s = 3000/s

1 + 1 + 4/3 = 3000/s

10/3 = 3000/s

s = 3000*3/10 = 900

m = 900

l =  4/3*900 = 1200

From the money that the countries plans to use and each missile cost, we can write the following equation:

200,000*s + 300,000*m + cost*l = 870,000,000

Replacing with previous result:

200,000*900 + 300,000*900 + cost*1200 = 870,000,000

cost = (870,000,000 - 200,000*900 - 300,000*900)/1200 = 350,000

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The product of 10 and 2 more than a number is 240. Find the number.
Maurinko [17]

Answer:

The number is 220

Step-by-step explanation:

Let n represent the number

10(2) + n = 240

20 + n = 240

240 - 20 = 220

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Given:

The points are (-3, 2) and (2, -13).

To find:

Slope-intercept form of the equation.

Solution:

Here x_1=-3, y_1=2, x_2=2, y_2=-13.

Slope of the line:

$m=\frac{y_2-y_1}{x_2-x_1}

$m=\frac{-13-2}{2-(-3)}

$m=\frac{-15}{5}

m = -3

Using point-slope formula:

y-y_1=m(x-x_1)

y-2=-3(x-(-3))

y-2=-3(x+3)

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Add 2 on both sides.

y-2+2=-3x-9+2

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Slope-intercept form of the equation is y = -3x - 7.

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