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3 years ago

9 more than two-sevenths a number is 45. What is the number? Also, show an explanation.

Mathematics

1 answer:

photoshop1234 [79]3 years ago

3 0

Answer:

x=126

Step-by-step explanation:

let 'x' represent the unknown number

(2/7)x + 9 = 45

Subtract 9 from both sides

2/7x=36

Because the fraction is being multiplied by 'x' we can multiply both sides by its reciprocal (because a fraction multiplied by its reciprocal is 1 which would 'eliminate' it from the left side therefore isolating 'x').

x=126

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What’s the answer to this problem?

kolbaska11 [484]

Hello :))

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4 years ago

Read 2 more answers

Carl bought 19 apples of 2 different varieties to make a pie.The total cost of the apple was $5.10.Granny Smith apples cost $0.2

disa [49]

For this case we propose a system of equations:

x: Let the variable representing the quantity of Granny Smith apples

y: Let the variable representing the number of Gala apples

According to the statement we have:

$x + y = 19\\0.25x + 0.30y = 5.10$

From the first equation we have to:

$x = 19-y$

replacing in the second equation:

$0.25 (19-y) + 0.30y = 5.10\\4.75-0.25y + 0.30y = 5.10\\4.75 + 0.05y = 5.10\\0.05y = 5.10-4.75\\0.05y = 0.35\\y = \frac {0.35} {0.05}\\y = 7$

So, Carl bought 7 Gala apples

On the other hand:

$x = 19-7 = 12$

So, Carl bought 12 Granny Smith apples

Answer:

Carl bought 7 Gala apples and 12 Granny Smith apples

8 0

3 years ago

Solve the equation. у+ 3 = -у +9 y=1 y= 3 y= 6 y= 9

Anna007 [38]

The first y equals -3 and the second y equals -9

8 0

3 years ago

2^x + 2^-x =5/2 pls I need d. ans

yKpoI14uk [10]

Answer:

x= 1, -1

Step-by-step explanation:

6 0

3 years ago

Please see attachment for the question.

Sophie [7]

Step-by-step explanation:

$\frac{10 {x}^{3} - 12 {x}^{2} + 6x - 7 }{ - 14 {x}^{2} - 1 }$

-14x²-1≠0

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Option C

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4 years ago