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kompoz [17]
3 years ago
14

30 is 12% of what numbr

Mathematics
1 answer:
ruslelena [56]3 years ago
5 0

30 IS 12% OF 250

HOPE IT HELPS! :D

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Solve this equation for x: 2x^2 + 12x - 7 = 0
zhannawk [14.2K]

Answer:

x=0.5355 or x=-6.5355

First step is to: Isolate the constant term by adding 7 to both sides

Step-by-step explanation:

We want to solve this equation: 2x^2 + 12x - 7 = 0

On observation, the trinomial is not factorizable so we use the Completing the square method.

Step 1: Isolate the constant term by adding 7 to both sides

2x^2 + 12x - 7+7 = 0+7\\2x^2 + 12x=7

Step 2: Divide the equation all through by the coefficient of x^2 which is 2.

x^2 + 6x=\frac{7}{2}

Step 3: Divide the coefficient of x by 2, square it and add it to both sides.

Coefficient of x=6

Divided by 2=3

Square of 3=3^2

Therefore, we have:

x^2 + 6x+3^2=\frac{7}{2}+3^2

Step 4: Write the Left Hand side in the form (x+k)^2

(x+3)^2=\frac{7}{2}+3^2\\(x+3)^2=12.5\\

Step 5: Take the square root of both sides and solve for x

x+3=\pm\sqrt{12.5}\\x=-3\pm \sqrt{12.5}\\x=-3+ \sqrt{12.5}, $ or $x= -3- \sqrt{12.5}\\$x=0.5355 or x=-6.5355

6 0
3 years ago
What time is 5 3/4 hours after 9:22pm
ExtremeBDS [4]
I think 4:45?...
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8 0
3 years ago
The diameter of the circle above is 22 cm. What is the circumference of the circle? (Use = 3.14.)
postnew [5]

Answer:

69.08cm

Step-by-step explanation:

The formula for the circumference is

pi times diameter=circumference

Since we are using 3.14 and we know the diameter we can plug that in

3.14 times 22= circumference

69.08=circumference

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3 years ago
Which number sentence is true?
PIT_PIT [208]

I'm pretty sure it's 8.5 > 2.97

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3 years ago
A 12 pack of lemonade costs $5.40.how much do each lemonade costs?
jok3333 [9.3K]
Each lemonade costs about $2.22. You can achieve this answer by dividing 12 by 5.40.
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3 years ago
Read 2 more answers
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