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swat32
3 years ago
8

Seven times a number minus the number is -48. Find the number.

Mathematics
2 answers:
yKpoI14uk [10]3 years ago
6 0
The answer youre looking for is -8!
Wittaler [7]3 years ago
3 0
Remark
Set up the equation from the word problem.

Equation
7*x - x = -48  Combine like terms 
6x = - 48 Divide by 6
x = - 48 / 6
x = - 8 <<<<<  Answer
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Determine which ordered pair is NOT a solution of y=3x-8
PtichkaEL [24]
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For (-6, -26): 3(-6) - 8 = -18 - 8 = -26  [solution]
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8 0
3 years ago
Evaluate the equation 4K-10/k=8
solong [7]

Answer:

k = 1 + sqrt(7/2) or k = 1 - sqrt(7/2)

Step-by-step explanation:

Solve for k over the real numbers:

4 k - 10/k = 8

Bring 4 k - 10/k together using the common denominator k:

(2 (2 k^2 - 5))/k = 8

Multiply both sides by k:

2 (2 k^2 - 5) = 8 k

Expand out terms of the left hand side:

4 k^2 - 10 = 8 k

Subtract 8 k from both sides:

4 k^2 - 8 k - 10 = 0

Divide both sides by 4:

k^2 - 2 k - 5/2 = 0

Add 5/2 to both sides:

k^2 - 2 k = 5/2

Add 1 to both sides:

k^2 - 2 k + 1 = 7/2

Write the left hand side as a square:

(k - 1)^2 = 7/2

Take the square root of both sides:

k - 1 = sqrt(7/2) or k - 1 = -sqrt(7/2)

Add 1 to both sides:

k = 1 + sqrt(7/2) or k - 1 = -sqrt(7/2)

Add 1 to both sides:

Answer: k = 1 + sqrt(7/2) or k = 1 - sqrt(7/2)

4 0
3 years ago
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4 0
3 years ago
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Answer:

triangle ABC is "not" a right-angled triangle

Step-by-step explanation:

AB=8cm

BC=5cm

perimeter = 22cm

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8² + 5² = 89

9² = 81

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4 0
3 years ago
Factor this trinomial completely. 2x2 + 6x + 4 O
svp [43]

Answer:

B.  2(x+2)(x+1)

Step-by-step explanation:

4 0
3 years ago
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