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3 years ago

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:

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

|-2 + 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 =

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) =

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