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denis23 [38]
3 years ago
11

Please help. I need answers sometime tomorrow but today would be nice. I am giveing the brainlist away to the smartest answer. P

lease give the answers in fraction form.

Mathematics
2 answers:
Lerok [7]3 years ago
8 0
Number 19 is wrong
Number one 10 is -35/20
ELEN [110]3 years ago
3 0

10 is -35/25

Number 14 is -2/3

Number 18 is 2 5/14

Step-by-step explanation:

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A parallelogram has sides 20cm and 30cm with an angle of 80 between the two sides. What is the length of each of the diagonals?
Lelu [443]

Answer:

length of diagonals are BD = 33.039 cm and AC = 38.84 cm

Step-by-step explanation:

given,

sides of parallelogram is 20 cm and 30 cm

Angle between them is 80°. opposite angle of parallelogram are same the opposite angle is same.

other angle  = 360° - 80° - 80° + 2 x = 200

                                        x = 100°

Using cosine law

c² = a² + b² - 2ab cos γ

In ΔDAB

BD² = 30² + 20 ² - 2 × 30 × 20 cos 80°

BD = 33.039 cm

now in ΔADC

c² = a² + b² - 2ab cos γ

AC² = 20² + 30² - 2 × 30 × 20 cos 100°

AC = 38.84 cm

length of diagonals are BD = 33.039 cm and AC = 38.84 cm

6 0
3 years ago
What is the area of triangle ABC?
kondor19780726 [428]

Answer: 7 square units

Step-by-step explanation:

<!> Brainliest is appreciated! <!>

6 0
3 years ago
In parallelogram ABCD, line AC is congruent to line BD. Is ABCD a rectangle?
Marina CMI [18]

9514 1404 393

Answer:

  A.  yes

Step-by-step explanation:

The diagonals of a rectangle are congruent and bisect each other.

The diagonals of a parallelogram bisect each other. If they are also congruent, then the parallelogram is a rectangle.

6 0
3 years ago
Isla is given $100,000 for college expenses. She deposits the money in a bank account that doesn't pay any interest on the money
BigorU [14]

Answer:

  • She still has $15000 in the account after she graduates

Step-by-step explanation:

Let the number of semesters is s and the balance id b(s)

<u>The balance after s semesters can be expressed as:</u>

  • b(s) = 100000 - 8500s

<u>After 10 semesters Isla has:</u>

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6 0
3 years ago
1 − 2 p + 5 = 4 p + 6 what is p in this equation
ipn [44]
1-2p+5=4p+6
6-2p=4p+6
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0=6p
0=p
6 0
3 years ago
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