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raketka [301]
3 years ago
10

Please help me i really need help please

Mathematics
2 answers:
Vanyuwa [196]3 years ago
8 0

Answer:

7: 100

8: 40

9: 74

Step-by-step explanation:

Serga [27]3 years ago
6 0

Answer:

7. x= 100 8. x= 40 and 9. x= 74

Step-by-step explanation:

x + 45 +35=180(sum of angle of triangle )

or, x+ 80=180

or, x=180-80

or, x=100

same process as above for all

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Cramers rule<br>hurry up plzzz​
olya-2409 [2.1K]

Answer:

Answers provided below

Step-by-step explanation:

From the simultaneous linear equation, we have the coefficient matrix as;

(3 4 5)

(2 -1 8)

(5 -2 7)

The x-matrix is Dx is given by;

(18 4 5)

(13 -1 8)

(20 -2 7)

Similarly, the y-matrix Dy is given by;

(3 18 5)

(2 13 8)

(5 -20 7)

Also,the z-matrix Dz is given by;

(3 4 18)

(2 -1 13)

(5 -2 -20)

Determinant of the coefficient matrix from online determinant calculator is;

D = 136

Determinant of the x-matrix from online determinant calculator is; Dx = 92

Determinant of the y-matrix from online determinant calculator is; Dy = 696

Determinant of the z-matrix from online determinant calculator is; Dz = 576

From crammers rule;

x = Dx/D = 92/136

y = Dy/D = 696/136

z = Dz/D = 576/136

6 0
2 years ago
Please help with these. I will give you brainlist
ser-zykov [4K]

Answer:

Step-by-step explanation:

3. slope of CB = rise/run = 5/12      BF = 5    CF = 12

BF ⊥ DF

DB (seg of two farthest points) = √BF²+DF² = √5²+32² = √1049 = 32.4

4. f(x) = 2x² - 5x -3      vertex : A (h,k)  for f(x) = ax² + bx +c

h = - b/2a = - (-5 / 4) = 5/4

f = f(h) = 2*(5/4)² - 5*(5/4) - 3 =25/8 - 25/4 -3 = -49/8

A (5/4 , - 49/8) i.e. (1.25 , - 6.13)

negative root:   2x² - 5x -3 = (2x+1) (x- 3)      x = - 1/2      y = 0

B (- 1/2 , 0)

x coordinate of AB: 1/2 (1.25 + -0.5) = 0.375

5 0
3 years ago
Read 2 more answers
Josh lives one for 6 miles from the park so far he walked 2/3 of the distance from his house to the park how many miles has josh
Naily [24]

Answer:

2

Step-by-step explanation:

6 0
3 years ago
Val tossed a coin 20 times. The results were 8 heads and 12 tails. What is the experimental probability of tossing heads?
Andrew [12]

Answer:

  2/5 or 0.40

Step-by-step explanation:

Val's result for heads is ...

  8/20 = 2/5 = 0.40

4 0
2 years ago
In the discussion box, write the next there numbers in each sequence 4,8,12,16__,__,__
frosja888 [35]

Answer:

20,24,28

Step-by-step explanation:

3 0
2 years ago
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