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Naya [18.7K]
3 years ago
15

12x-20y=108 3x+ky=27 what is k

Mathematics
1 answer:
Sedaia [141]3 years ago
3 0

Let's look at the second equation and try multiplying it by 4:

4 * (3x + ky) = 4 * 27

Which gives us:

12x + 4ky = 108

This looks almost exactly like the first equation except that instead of -20y, there is 4ky. We could try making them equal to each other and solving for k:

-20y = 4ky

-20 = 4k

k = -5

Then, the answer is k = -5.

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3 years ago
I'll give the brainiest
Nostrana [21]

Answer:

True

Step-by-step explanation:

Squares are quadrilaterals with 4 congruent sides and 4 right angles, and they also have two sets of parallel sides. Parallelograms are quadrilaterals with two sets of parallel sides. Since squares must be quadrilaterals with two sets of parallel sides, then all squares are parallelograms.

8 0
3 years ago
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Geometry help with number 18!
lora16 [44]
BE is parallel to CD, therefore, m∠BEC=m∠ECD, therefore mBC=mDE
BE is the diameter, so Arc BE is 180 degree
mBC+mCD+mDE=180
replace mCD with 3mBC, and replace mDE with mBC: mBC+3mBC+mBC=180
5mBC=180
mBC=180/5=36
mCD=3mBC=3*36=108
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4 0
4 years ago
Please help :) thanks
professor190 [17]

Answer:

8, 4, 0, -1

Step-by-step explanation:

8 0
3 years ago
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I NEED HELP PLEASE! :)
frosja888 [35]

Answer: \frac{1372}{3}\pi

This is the same as \frac{1372\pi}{3}

units are in cubic centimeters

==============================================

Work Shown:

d = 14 is the diameter

r = d/2 = 14/2 = 7 is the radius

V = \frac{4}{3}\pi*r^3\\\\V = \frac{4}{3}\pi*7^3\\\\V = \frac{4}{3}\pi*343\\\\V = \frac{4}{3}*343\pi\\\\V = \frac{4}{3}*\frac{343}{1}\pi\\\\V = \frac{4*343}{3*1}\pi\\\\V = \frac{1372}{3}\pi\\\\

8 0
3 years ago
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