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VashaNatasha [74]
3 years ago
12

Can someone tell me the answer and explain it please

Mathematics
1 answer:
Mkey [24]3 years ago
8 0

Answer:

x^2 - y^2

Step-by-step explanation:

In the following problem, we can use the distributive property to simplify:

(x + y)(x - y)

We can start by multiplying the x's together, giving us x^2.

Next is the first x multiplied by -y in the second parenthesis. This gives us -xy.

Now, we can move on the the y in the first parenthesis: y times x(in the second parenthesis) is xy.

Lastly, we have y times -y which gives us -y^2.

(This process is shown in the image attached)

If we aa these together we get:

x^2 - xy + xy - y^2

If we add -xy and xy it would be 0 because if you add a number with it's opposite, they cancel out. We are just left with x^2 - y^2.

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Someone please help! I have spent lots of time on this and I’m still confused
vfiekz [6]

Answer:

its the 3rd choice.

Step-by-step explanation:

Firstly, we find angle BDC (180-90-30=60)

Now that we found it we can use the sine rule to find DB (which i put as an x), which is sin60/14=sin30/x, by cross multiplication, we find that its equal to a decimal number, i will use its root version to this easier, its equal to 14sqrt3/3 inches.

And now we use the pythagorean theorem to find DC, we find that it is equal to 28sqrt3/3

Now, we find angle BAC (180-90-(30+15)=45)

Again, we use the sine rule to find AB (whom i will refer to as x and from whom we will subtract DB to find the length of AD), so we cross multiply in sin45/14=sin(30+15)/x, it is equal to 14.

So since AB-DC=AD

14-(14sqrt3/3)= 5.917096231 (and we ound that to a 5.9)

3 0
3 years ago
Thanks plz help important thanks you I need help plz I give brainliest
bekas [8.4K]
13 < 12

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6 0
3 years ago
a model train has a scale of 1 in: 7 ft. If the real train is 14 ft. tall, how tall is the model train?
-BARSIC- [3]

Answer:

2 in.

Step-by-step explanation:

14/7=2

4 0
3 years ago
Whats the answer for 55.78 +4.6
Katarina [22]
60.38 is the answer to this
3 0
4 years ago
Read 2 more answers
I am doing a online course on rational expressions, specifically complex fractions without variables, does anyone know what happ
Lady bird [3.3K]

Answer:

\boxed{\mathrm{view \ explanation}}

Step-by-step explanation:

<u>9</u>/14 × 5/<u>3</u>

The factors can be canceled if they are factors of both the numerator of the first fraction and the denominator of the second fraction. The factors get cancelled leaving the second fraction to a whole number.

3/14 × 5

(3 × 5)/14

15/14

3 0
3 years ago
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