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puteri [66]
4 years ago
12

X - 13 = 5x + 7 a) -5 b) 3 c) 6 d) 2

Mathematics
1 answer:
Alex4 years ago
6 0

x-13=5x+7\ \ \ \ |+13\\\\x=5x+20\ \ \ \ |-5x\\\\-4x=20\ \ \ \ |:(-4)\\\\x=-5\\\\Answer:\ a)\ -5

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Answer:

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Step-by-step explanation:

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3 years ago
What is -10=-14v + 14v
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0=-10
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This is the answer to this question
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4 years ago
Elaine's Grocery has a lunch counter where people can order 3 types of sandwiches egg salad, chicken salad, or falafel. Sandwich
Ksenya-84 [330]
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Read 2 more answers
If f(x)=ax+b/x and f(1)=1 and f(2)=5, what is the value of A and B?
LUCKY_DIMON [66]

Answer:

\huge\boxed{a=9 ; b = -8}

Step-by-step explanation:

f(x) = \frac{ax+b}{x}

Putting x = 1

=> f(1) = \frac{a(1)+b}{1}

Given that f(1) = 1

=> 1 = a + b

=> a+b = 1  -------------------(1)

Now,

Putting x = 2

=> f(2) = \frac{a(2)+b}{2}

Given that f(2) = 5

=> 5 = \frac{2a+b}{2}

=> 2a+b = 5*2

=> 2a+b = 10  ----------------(2)

Subtracting (2) from (1)

a+b-(2a+b) = 1-10\\a+b-2a-b = -9\\a-2a = -9\\-a = -9\\a = 9

For b , Put a = 9 in equation (1)

9+b = 1\\Subtracting \ both \ sides \ by \ 9\\b = 1-9\\b = -8

5 0
3 years ago
-Subtract and simplify -y^2-3y-5)-(x36^2-7y+4
AnnZ [28]

Answer:

-y^2 - 10 y - x^72 + -1

Step-by-step explanation:

Simplify the following:

-y^2 - 3 y - 5 - (x^36)^2 - 7 y + 4

Multiply exponents. (x^36)^2 = x^(36×2):

-y^2 - 3 y - 5 - x^(36×2) - 7 y + 4

36×2 = 72:

-y^2 - 3 y - 5 - x^72 - 7 y + 4

Grouping like terms, -y^2 - 3 y - 5 - x^72 - 7 y + 4 = -y^2 + (-3 y - 7 y) - x^72 + (4 - 5):

-y^2 + (-3 y - 7 y) - x^72 + (4 - 5)

-3 y - 7 y = -10 y:

-y^2 + -10 y - x^72 + (4 - 5)

4 - 5 = -1:

Answer: -y^2 - 10 y - x^72 + -1

5 0
3 years ago
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