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tangare [24]
3 years ago
12

What is the measure of ZDBE? O A. 170° OB. 85° O c. 40° O D. 130

Mathematics
1 answer:
inessss [21]3 years ago
3 0
The measure of ZDBE is 40 degrees
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Solve the following system of equations.<br> 2x + 5y = -18 and y = -4x
andriy [413]

Answer:

x=1 and y= -4

Step-by-step explanation:

step one: plug -4x into y in thi]e first equation.

2x+5(-4)= -18

step two: solve for x

2x-20= -18

(add 20 to both sides to eliminate -20 on the right)

2x=2

(divide both sides by 2 to get x by its self)

x=1

step 3: now that we found the value for x plug it in to either equation and solve for y

y= -4x

y= -4(1)

y= -4

7 0
3 years ago
A person buys X meter for 5
Nady [450]

Step-by-step explanation:

I guess, it means every meter costs these amounts.

and the specified costs are not fit the whole bundle.

it is also unclear, if "half of it" means half of the original x meters, or half of the remaining meters (after selling 2/5 of the original meters). I assume the first.

so, we have

-5x

+ 2/5x × 5.5

+ 1/2x × 6.4

+ (10/10 - 4/10 - 5/10)x × 6 = + 1/10x × 6

= 120 ( a income minus costs is the profit, so balancing both sides in a "+" and "-" expression gives us the remaining profit).

about the line with the 1/10 :

the leftovers. 10/10 is the whole x at the beginning.

2/5 = 4/10.

1/2 = 5/10.

I brought all involved fractions to the same denominator of the smallest common multiple of 2 and 5 (10).

in full

-5x + (2/5)x×5.5 + (1/2)x×6.4 + (1/10)x×6 = 120

-5x + 2.2x + 3.2x + 0.6x = 120

-5x + 6x = 120

x = 120

so, he bought 120m in the first place.

8 0
2 years ago
I need help, please and thank you. I know that you have to multiply the diameter by 2 to find the radius, but with the 9 pi, it
andrew11 [14]

Answer:

r=6

Step-by-step explanation:

The area of a circle is given by πr². Note that this uses the radius, not the diameter.

Now, one quarter of this area (ABC) is given to be 9π.

So apparently:

\frac14 \pi r^2 = 9\pi

If you solve this:

\frac14 r^2 = 9 (divide both sides by π)

r^2 = 9\cdot4 (multiply both sides by 4)

so

r = √36 = 6

so the radius is 6.

4 0
3 years ago
If the rates of change are variable, the equation is linear.<br><br> True<br><br> False
kirill [66]
True is correct 

brainliest?  plz/thx or nope/not today
8 0
3 years ago
Read 2 more answers
The circle below is centered at the point (4,3) and has a radius length 5. What is its equation
marusya05 [52]
Well, equation of circle is (X-X1)^2 + (Y-Y1)^2 = R^2

so, (X-4)^2 + (Y-3)^2 = 25

X^2 + 16 -8X + Y^2 + 9 - 6Y = 25

X^2 + Y^2  - 8X - 6Y = 0

this is the correct answer hope it helped :)
inbox me and tell me if it was correct or not
6 0
3 years ago
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