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3 years ago

I need help please with this math problem

Mathematics

1 answer:

Arada [10]3 years ago

8 0

When the dilation is centered on the origin, you can multiply each of the individual coordinates by the scale factor.

All the coordinates are ±5 and the scale factor is 1/5. Multiplying those gives ±1. The only selection with all coordinates being ±1 is
.. Selection A.

You can check to see if the signs agree in detail. (They do.)

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I got x = 45 And I was wondering if anyone one could tell me if im correct

slamgirl [31]

Answer:

x = 45°

Step-by-step explanation:

Congruence of Angles:

Linear angles are those consecutive angles formed when two lines cross. Their sum of linear angles is 180°.

Corresponding angles are those which occupy the same relative position at each intersection where a straight line crosses two others. If the two lines are parallel, the corresponding angles are congruent.

From the provided figure, angles y and 3x-60 are linear, thus:

y + 3x - 60 = 180

y = 180 - 3x + 60

y = 240 - 3x

Also, being p and q parallel lines, angles y and 2x+15 are corresponding, thus:

240 - 3x = 2x + 15

Adding 3x:

240 = 2x + 3x + 15 = 5x + 15

Subtracting 15:

240 - 15 =5x = 225

Dividing by 5:

x = 225 / 5 = 45

x = 45°

3 0

3 years ago

Which equation of a line is written in slope-intercept form?

aleksandrvk [35]

Answer:

a) y = -7x +1

Step-by-step explanation:

Slope-intercept form is ...

y = mx + b

The other forms shown are various ways this can be rearranged, but they are not slope-intercept form.

6 0

3 years ago

Which of the following is the best estimate for checking the given problem

Elan Coil [88]

The best estimate is 478,000,000 x 2,500,000

7 0

3 years ago

The Perimeter of a Pentagon is 20.5 centimeters. Four sides of this pentagon have the same length, in centimeters, x, and the ot

RideAnS [48]

Answer:

$4.6\ \text{cm}$

Step-by-step explanation:

Perimeter of the pentagon = 20.5 cm

Length of 4 sides = $x$

Length of the other side = 2.1 cm

Perimeter of the pentagon will be

$x+x+x+x+2.1=20.5\\\Rightarrow 4x+2.1=20.5\\\Rightarrow 4x=20.5-2.1\\\Rightarrow 4x=18.4\\\Rightarrow x=\dfrac{18.4}{4}\\\Rightarrow x=4.6\ \text{cm}$

The value of $x$ is $4.6\ \text{cm}$ .

3 0

3 years ago

State one form of the Law of Cosines and provide a trick for writing the other two forms and explain when Law of Cosines should

Yuki888 [10]

Solving for Angles

$\displaystyle \frac{a^2 + b^2 - c^2}{2ab} = cos∠C \\ \frac{a^2 - b^2 + c^2}{2ac} = cos∠B \\ \frac{-a^2 + b^2 + c^2}{2bc} = cos∠A$

* Do not forget to use the inverse function towards the end, or elce you will throw your answer off!

Solving for Edges

$\displaystyle b^2 + a^2 - 2ba\:cos∠C = c^2 \\ c^2 + a^2 - 2ca\:cos∠B = b^2 \\ c^2 + b^2 - 2cb\:cos∠A = a^2$

You would use this law under two conditions:

One angle and two edges defined, while trying to solve for the third edge
ALL three edges defined

* Just make sure to use the inverse function towards the end, or elce you will throw your answer off!

_____________________________________________

Now, JUST IN CASE, you would use the Law of Sines under three conditions:

Two angles and one edge defined, while trying to solve for the second edge
One angle and two edges defined, while trying to solve for the second angle
ALL three angles defined [of which does not occur very often, but it all refers back to the first bullet]

* I HIGHLY suggest you keep note of all of this significant information. You will need it going into the future.

I am delighted to assist you at any time.

7 0

3 years ago