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Andrews [41]
3 years ago
6

How do you solve this

Mathematics
1 answer:
Yuliya22 [10]3 years ago
7 0
The 2 dots equal each other
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What is the image point of (2,7) after the transformation r y=-x R270?
Semmy [17]

Answer:

0

Step-by-step explanation:|-2 - (-1)| =

|-2 + 1| =

| -1 | =

1.

 

So, we're one unit away from y = -1.  If we're one unit ABOVE y=-1, we need to move the point to be one unit BELOW it instead.  And if we're one unit BELOW y = -1, we need to move the point to be one unit ABOVE it.  

 

Since the point has a y-coordinate of -2, its BELOW the line y = -1, by 1 unit.  Now we change the y-coordinate so its instead ABOVE y = -1, by 1 unit:

 

(y-coordinate of reflection line) + (number of units above that line) =

-1 + 1 =

0.

 

Our new y-coordinate is 0, so the point is now at

(7, 0).

 

A more mechanical, but less intuitive approach is as follows:  

Let L = the y-coordinate of the line, and

P = the y-coordinate of the point.

The new y-coordinate is 2L - P.

In this case, L = -1, and P = -2.  So we have

2L - P =

2(-1) - (-2) =

-2 -(-2) =

0.

5 0
2 years ago
Lexi has a cylindrical trash can with a diameter of 26cm and a height of 50 cm. What is the
egoroff_w [7]

Answer:

HELPP

Step-by-step explanation:

LOl

4 0
2 years ago
What is the exact value of the expression the square root of 20. + the square root of 24. - the square root 54.? simplify if pos
aksik [14]
\sqrt{20} =  \sqrt{4}  \sqrt{5}  = 2 \sqrt{5}
\sqrt{24} =  \sqrt{4} \sqrt{6} = 2 \sqrt{6}
\sqrt{54} =  \sqrt{9} \sqrt{6} = 3 \sqrt{6}

Because you can only add and subtract radicals with the same radicand,
you get 2\sqrt{5} -  \sqrt{6}
that is the simplified answer but if you want it in decimals, 2.022 is what you get.
4 0
3 years ago
Read 2 more answers
Need help! Law of cosines...find b round to the nearest tenth please
dusya [7]
ANSWER

B = 27.8 \degree

EXPLANATION

The law of cosine is given by the formula:

{b}^{2} = {a}^{2} + {c}^{2} - 2bc \cos(B)

From the diagram,

a=17, b=8, c=16

We substitute the given values into the formula to obtain:

{8}^{2} = {17}^{2} + {16}^{2} - 2(17)(16)\cos(B)

64 = 289+ 256- 544\cos(B)


64 = 545- 544\cos(B)


64 - 545 = - 544\cos(B)

- 481 = - 544\cos(B)

\frac{ - 481}{ - 544} = \cos(B)

cos(B) = 0.88419

B = \cos ^{ - 1} (0.88419)

B = 27.8 \degree
3 0
3 years ago
Read 2 more answers
5/8 - 3/4(7 - 1/3) + 1
erastovalidia [21]
-3.375 :))))))))))))))
8 0
3 years ago
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