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BlackZzzverrR [31]
3 years ago
9

Find -3a2 - b3 + 3c2 - 2b3 if a = 2, b = -1, and c = 3

Mathematics
2 answers:
andreyandreev [35.5K]3 years ago
7 0
<span>The first thing you want to do, is to substitute the  given to the equation. It will look like this:
-3(2)2 + 3(3)2 -2(1)3. 
Remember the MDAS method (Multiply, Division, Addition and Subtract.) So, you need to multiply all the numbers we have substitute in the equation.
-12 + 18 - 6. 
Then, remember to add comes first and subtraction comes last. So, we need to add -12 and +18 that will lead to this:
+6 - 6
Since -12 is negative and +18 is postive, so if we’ll add them up it’s +6. It is positive since +18 is bigger than -12. The answer is zero (0.)</span><span><span>
</span></span>
Studentka2010 [4]3 years ago
6 0
If you would like to solve - 3 * a^2 - b^3 + 3 * c^2 - 2 * b^3, if a = 2, b = -1, c = 3, you can calculate this using the following steps:

a = 2, b = -1, c = 3
- 3 * a^2 - b^3 + 3 * c^2 - 2 * b^3 = - 3 * 2^2 - (-1)^3 + 3 * 3^2 - 2 * (-1)^3 = - 3 * 4 - (-1) + 3 * 9 - 2 * (-1) = - 12 + 1 + 27 + 2 = 18

The correct result would be 18.

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Find the area. Simplify your answer.<br> X+4<br> 2x
sattari [20]

Answer:

x² +4x

Step-by-step explanation:

Area of triangle= ½ ×base ×height

Given: base= 2x, height= x +4

Area of triangle

= ½(2x)(x +4)

= x(x +4)

= x(x) +x(4) <em>(</em><em>expand)</em>

= x² +4x

7 0
2 years ago
If 15% of 200 apples are bad, how many apples are bad?
jarptica [38.1K]
<h3><u>given</u><u>:</u></h3>

apples= 200

bad apples= 15%

<h3><u>to</u><u> </u><u>find</u><u>:</u></h3>

how many apples are bad.

<h3><u>solution</u><u>:</u></h3>

<u>200 \times  \frac{15}{100}</u>

<u>= 30</u>

<u>therefore</u><u>,</u><u> </u><u>there</u><u> </u><u>are</u><u> </u><u>3</u><u>0</u><u> </u><u>bad</u><u> </u><u>apples</u><u>.</u>

5 0
2 years ago
Solve 3x + 23 + x = 7. x = −4 x = 4 x = −0.25 x = 0.25
Maksim231197 [3]
<h2>______________________________</h2><h2>Solve for x | Solution and Explanation </h2>

______________________________________________

Hello! So...

We are given the following:

Solve for x.

3x+23+x=7

====================

1. Group the like terms.

  • 3x+x+23=7

====================

2. Add similar elements (3x+x=4x).

  • 4x+23=7

====================

3. Subtract 23 from both sides.

  • 4x + 23 - 23 = 7 - 23

====================

4. Simplify.

  • 4x=-16

====================

5. Divide both sides by 4.

  • \frac{4x}{4} =\frac{-16}{4}

====================

6. Simplify.

  • x=-4 (aka. Option A)

====================

Hope this helps!

3 0
1 year ago
Which of the following coordinates represents a point that is collinear with the given points.
charle [14.2K]

Answer:

A) (-4,-1)

Step-by-step explanation:

a line graphed with those coordinates would have a slope of -3/12, or -1/4.

Following that slope, you would go through (-4,-1).  So that is the point collinear with the given points.

8 0
3 years ago
Read 2 more answers
For a Valentine's Day dance, tickets for couples cost $12 and tickets for individuals cost $8. Suppose 250 students attended the
lakkis [162]

Answer: 105 couple tickets and 40 individual tickets

For this I will use the "Graphing Method"

     First, we need to set up two equations.

-> Let x be the number of couple tickets.

-> Let y be the number of individual tickets.

-> It is "2x" because a couple means two.

     $12x + $8y = $1,580

     2x + y = 250

     Next, we will graph this.

-> The point at which the two lines intersect is our solution.

-> See attached.

-> x = 105, so 105 couple tickets

-> y = 40, so 40 individual tickets

Have a nice day!

     I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly.

- Heather

6 0
2 years ago
Read 2 more answers
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