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IrinaK [193]
2 years ago
14

Please help!! please please

Mathematics
1 answer:
Leona [35]2 years ago
5 0
I honestly don'y know i'm really sorry.

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Answer to the question
torisob [31]

Answer:

b. DC = 29 and DE = 44.5

Step-by-step explanation:

Given:

AB = 29

BD = 89

Required:

DC and DE

Solution:

✔️DC = AB (opposite sides of a parallelogram are equal)

Therefore,

DC = 29 (Substitution)

✔️DE = half of diagonal BD (Diagonals of a parallelogram bisect each other)

DE = ½(89)

DE = 44.5

5 0
2 years ago
What is the total length of weather stripping needed for 12 windows that each measure 90 cm by 12?
marishachu [46]

Area or perimeter????



8 0
3 years ago
Find the total surface area for the following. <br>height-3m, length-300 cm and width- 2 cm.​
Delvig [45]

Answer:

Step-by-step explanation:

So the Dimensions are:

Height: 300cm

Length: 300cm

Width: 2cm

SA = 2(H*L)+2(H*W)+2(L*W)

= 180000 + 1200 + 1200

= 182400 cm^{2} OR 18.24m^{2}

6 0
3 years ago
Read 2 more answers
Need help with a system of equations
sweet [91]

Answer:

\boxed{x - y = -2\sqrt{7}}

Given:

x + y = 4 \\  \\  {x}^{2}  +  {y}^{2}  = 22 \\  \\  {x}^{4}  =  {y}^{4}  - 176 \sqrt{7}

Step-by-step explanation:

=  >  {x}^{4}  =  {y}^{4}  - 176 \sqrt{7}  \\  \\  =  >  {x}^{4}  -  {y}^{4}  =  - 176 \sqrt{7}  \\  \\  =  >  {( {x}^{2}) }^{2}  -  { ({y}^{2}) }^{2}  =  - 176 \sqrt{7}  \\  \\  =  > ( {x}^{2}  +  {y}^{2} )( {x}^{2}  -  {y}^{2} ) =  - 176 \sqrt{7}  \\  \\  =  > ( {x}^{2} +  {y}^{2})  (x + y)(x - y) =  - 176 \sqrt{?}  \\  \\  =  > 22 \times 4(x - y) =  - 176 \sqrt{7}  \\  \\  =  > 88(x - y) =  - 176 \sqrt{7}  \\  \\ =  >  x - y =  -  \frac{176 \sqrt{7} }{88}  \\  \\  =  > x - y =  - 2 \sqrt{7}

Identity used:

{x}^{2}  -  {y}^{2} = (x + y)(x - y)

7 0
3 years ago
Read 2 more answers
Factor the expression.
tiny-mole [99]
B. (k+10f)(k-5f) you can tell in 2 ways.  1. if the second sign is neg then the signs in the factors are going to be one neg and one positive so that knocks out C and D.  Then you look at the second term and since the 5 is positive then the 10 has to be positive so you end up with a positive 5kf.

The second way is to FOIL them out.  When you check B you get k^{2} -5kf+10kf- 50f^{2} combine your like terms and you have your original expression of k^{2} +5kf-50 f^{2}

Hope that helps
3 0
3 years ago
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