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uranmaximum [27]
2 years ago
14

What is the answer??

Mathematics
2 answers:
user100 [1]2 years ago
4 0

Answer:

letter C is the right answer

k0ka [10]2 years ago
4 0
I believe it’s C I don’t know if i’m right tho gudluk haha
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The sum of three numbers is 26. Twice the first minus the second is the third less 2. The third is the second minus 3 times the
Agata [3.3K]

Let a, b, c represent the three numbers. The problem statement gives rise to three equations:

  • a +b +c = 26
  • 2a -b = c -2
  • -3a +b = c

Adding the first two equations gives

... (a +b +c) +(2a -b) = (26) +(c -2)

... 3a +c = 24 +c . . . . . simplify

... 3a = 24 . . . . . . . . . . subtract c

... a = 8 . . . . . . . . . . . . divide by 3

Adding the second and third equations gives ...

... (2a -b) +(-3a +b) = (c -2) +(c)

... -a = 2c -2 . . . . simplify

... -6 = 2c . . . . . . add 2, substitute for a

... -3 = c . . . . . . . . divide by 2

Using the third equation we can find b.

... -3·8 +b = -3 . . . . substitute for a and c

... b = 21 . . . . . . . . .add 24

The numbers are 8, 21, -3.

_____

The method above is sort of "ad hoc", taking advantage of the numbers in this particular set of equations. You can use more formal methods of Gaussian elimination or Cramer's Rule to solve these by just following a procedure. Or, your graphing calculator can do it for you.

6 0
3 years ago
Factorise 10+5d help me plssssss
aleksley [76]

5(2 + d)
Since 5 is divisible by 10 and 5, we can factor out a 5 from both terms.
8 0
2 years ago
Danielle has her finals coming up and she's worried she'll fail her class. Her past 3 test grades were a 72. an 85, and a 68. Sh
natka813 [3]

Answer:

55

Step-by-step explanation:

7 0
3 years ago
3x 3/5 help me please
ser-zykov [4K]

Answer:

9/5

Step-by-step explanation:

it is because 3/1 × 3×5

so which means 9/5

8 0
2 years ago
Read 2 more answers
I need help !!!!!!!!!!!!!!! For 1 and 2
11Alexandr11 [23.1K]

Answer:

#1: 5

#2: \sqrt{40}

Step-by-step explanation:

Inverse of Pythagorean Theorem:  c²-b²=a²

c²   b²      a²

13²- 12² = 25

\sqrt{25} = 5

Pythagorean Theorem: a²+b²=c²

a²    b²     c²

2² + 6² = 40

c = \sqrt{40}

5 0
3 years ago
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