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3 years ago

Hi can anyone just help me please to see if I did my maths right. Thanks.

Mathematics

2 answers:

IgorLugansk [536]3 years ago

7 0

Yep... I think you did but tbh I don’t understand that sooo

ololo11 [35]3 years ago

5 0

This is not an answer but can anyone help me with this question? brainly.com/question/8143527

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Area of a triangle with points at (-9,5), (6,10), and (2,-10)

Ann [662]

First we are going to draw the triangle using the given coordinates.
Next, we are going to use the distance formula to find the sides of our triangle.
Distance formula: $d= \sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2}$

Distance from point A to point B:
$d_{AB}= \sqrt{[6-(-9)]^2+(10-5)^2}$
$d_{AB}= \sqrt{(6+9)^2+(10-5)^2}$
$d_{AB}= \sqrt{(15)^2+(5)^2}$
$d_{AB}= \sqrt{225+25}$
$d_{AB}= \sqrt{250}$
$d_{AB}=15.81$

Distance from point A to point C:
$d_{AC}= \sqrt{[2-(-9)]^2+(-10-5)^2}$
$d_{AC}= \sqrt{(2+9)^2+(-10-5)^2}$
$d_{AC}= \sqrt{11^2+(-15)^2}$
$d_{AC}= \sqrt{121+225}$
$d_{AC}= \sqrt{346}$
$d_{AC}= 18.60$

Distance from point B from point C
$d_{BC}= \sqrt{(2-6)^2+(-10-10)^2}$
$d_{BC}= \sqrt{(-4)^2+(-20)^2}$
$d_{BC}= \sqrt{16+400}$
$d_{BC}= \sqrt{416}$
$d_{BC}=20.40$

Now, we are going to find the semi-perimeter of our triangle using the semi-perimeter formula:
$s= \frac{AB+AC+BC}{2}$
$s= \frac{15.81+18.60+20.40}{2}$
$s= \frac{54.81}{2}$
$s=27.41$

Finally, to find the area of our triangle, we are going to use Heron's formula:
$A= \sqrt{s(s-AB)(s-AC)(s-BC)}$
$A=\sqrt{27.41(27.41-15.81)(27.41-18.60)(27.41-20.40)}$
$A= \sqrt{27.41(11.6)(8.81)(7.01)}$
$A=140.13$

We can conclude that the perimeter of our triangle is 140.13 square units.

3 0

3 years ago

The sum of x and it’s opposite is always zero?

jeka94

Answer:

1) Let's consider the first case with the number 0 the oppose is also 0 and we have that 0-0=0 so then applies

2) Now let's consider any real number a no matter positive or negative we will have that:

$a-a =0$

Or in the other case:

$-a -(-a) =-a +a=0$

So then we can conclude that the expression is a general rule and is true

Step-by-step explanation:

For this case we can verify if the following expression is true or false:

The sum of x and it’s opposite is always zero?

If we want to proof this we need to show that for any number is true.

1) Let's consider the first case with the number 0 the oppose is also 0 and we have that 0-0=0 so then applies

2) Now let's consider any real number a no matter positive or negative we will have that:

$a-a =0$

Or in the other case:

$-a -(-a) =-a +a=0$

So then we can conclude that the expression is a general rule and is true

5 0

3 years ago

Which expression is equivalent to 3x + 2.5(4x + 2)?

Alex787 [66]

Answer:

I think its B

Step-by-step explanation:

Hope this helps:)

6 0

2 years ago

Read 2 more answers

A machine produces 40 spools of nylon each day. On the first day of production, 10 spools have to be thrown away.What percentage

Assoli18 [71]

40 spools = 100%
30 spools = ?

30/40*100
= 75%.

Hope this helps

8 0

3 years ago

Can someone help me solve this and explain it to me? <br> −1/6(x−18)+1/3(x+3)=x+4

KATRIN_1 [288]

Answer:

Below.

Step-by-step explanation:

So calculate.

-1/6x+3+1/3x+1=x+4.

Cancel equal terms.

-1/6x+4+1/3x=x+4

Multiply both sides -1/6x+1/3x=x

collect like terms.

-x+2x=6x

move the variable from right to left.

x=6x

collect like terms

x-6x=0

Divide both sides

-5x=0

x=0

7 0

2 years ago