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Lerok [7]
3 years ago
10

Erica used friendly numbers to find 43-19. She added 1 to 19 and subtracted 1 from 43. What is Erica's error?

Mathematics
2 answers:
Naily [24]3 years ago
8 0
I think that it is....
42-20=22
Olenka [21]3 years ago
7 0
She could have added 1 to 19 to give 20 then subtracted  this from 43 to give 23. Then she can add the 1 to 23 to get the correct answer which is 24.
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Can someone help me find x of this triangle
uysha [10]

Answer:

x = 9

Step-by-step explanation:

Sum of a triangle is 180°.

6x + 1 + 6x - 14 + 9x + 4 = 180°

Arrange the like terms together and simply this equation.

6x + 6x + 9x + 1 + 4 - 14 = 180°

21x - 9 = 180°

Shifting '-9' to the other side of the equation gives you '+9'

21x = 180° + 9

21x = 189

Shifting 21 to the other side of the equation (to get x) makes it  ÷21 (multiply)

x = 189 ÷ 21

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3 0
3 years ago
From a point T on a horizontal ground, the angle of
grin007 [14]

Answer:

distance TS ≈ 19 m (nearest meter)

Step-by-step explanation:

The point T is on the horizontal ground and the angle of elevation of the top R of a tower is 63° and the height of the tower is 38 m high. The illustration forms  a right angle triangle. The height RS of the tower is the opposite side of the triangle formed. The hypotenuse side of the triangle is the point from the ground T to the top of the tower R.  The adjacent side of the triangle is the side TS.

using tangential ratio

tan 63° = opposite/adjacent

tan 63° = 38/adjacent

cross multiply

adjacent tan 63° = 38

divide both sides by tan 63°

adjacent side = 38/tan 63°

adjacent side = 38/1.96261050551

adjacent side = 19.3619670807

distance TS ≈ 19 m (nearest meter)

6 0
3 years ago
7+3x-12x=3x+1 is it Infinitely many solutions, one solution, or no solutions with steps please
alisha [4.7K]

Answer:

  • One solution

Step-by-step explanation:

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It has one solution

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3 years ago
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4 0
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Give the Solution to the System of
Illusion [34]

Answer:

Step-by-step explanation:

-10 g

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