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sladkih [1.3K]
3 years ago
11

Math please save me

Mathematics
1 answer:
Naily [24]3 years ago
4 0
The answer is 18 beacause 6+6+2+4=18

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Given: △DMN, DM=10 3 m∠M=75°, m∠N=45° Find: Perimeter of △DMN
OlgaM077 [116]

Angle D is 180° -75° -45° = 60°. Drawing altitude MX to segment DN divides the triangle into ΔMDX, a 30°-60°-90° triangle, and ΔMNX, a 45°-45°-90° triangle. We know the side ratios of such triangles (shortest-to-longest) are ...

... 30-60-90: 1 : √3 : 2

... 45-45-90: 1 : 1 : √2

The long side of ΔMDX is 10√3, so the other two sides are

... MX = MD(√3/2) = 15

... DX = MD(1/2) = 5√3

The short side of ΔMNX is MX = 15, so the other two sides are

... NX = MX(1) = 15

... MN = MX(√2) = 15√2

Then the perimeter of ΔDMN is ...

... P = DM + MN + NX + XD

... P = 10√3 +15√2 + 15 + 5√3

... P = 15√3 +15√2 +15 . . . . perimeter of ΔDMN

5 0
3 years ago
I need help please !!!!!!!!
denpristay [2]

Answer:

B. 7√3

Step-by-step explanation:

30-60-90 triangles have special side proportions that would be very beneficial to memorize because I guarantee you will use it in the future.

Please see the attached image.

The answer is 7*√3=7√3

6 0
3 years ago
Read 2 more answers
PLEASE HELP LAST PROBLEM I NEED HELP ON (Homework Help)
V125BC [204]

Answer:

a

Step-by-step explanation:

so the 2 in front means stretch 0f 2 the -3 in the parenthaesis means right 3 and the 1 means up 1

7 0
3 years ago
X is six more than four times the value of y.
Oksana_A [137]
Therefore
(4y+6) +y = 46

We can combine the like terms:
5y + 6 = 46

Subtract 6 on both sides:

5y+6-6=46-6

Therefore 5y =40

Divide by 5 on both sides

5y/5 = 40/5

Therefore

y= 8
We found y but to find the value x we use y.

X= 4y+6

Therefore
x= (4*8)+ 6

Therefore

x= 32 + 6

x= 38.
7 0
3 years ago
Read 2 more answers
"find the cost per ounce of a sunscreen made from 140 oz of lotion that cost $3.45 per ounce and 90 oz of lotion that cost $14.0
Olegator [25]
Sunscreen approx. 40.6 cents an oz 
Lotion 6.4 cents an oz
5 0
3 years ago
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