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Alisiya [41]
3 years ago
10

What is the value of x in the equation 8 + 4 = 2(x - 1)?

Mathematics
1 answer:
kramer3 years ago
8 0

Answer:

Step-by-step explanation:

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At a grand-opening sale, 20% of the first 500 customers won a prize. How many of the first 500 customers won a prize ?
katrin2010 [14]

Answer:

100

Step-by-step explanation:

5 0
3 years ago
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Which equation is the inverse of y = 9x2 - 4?
m_a_m_a [10]

Answer:

The inverse will be:

y' = \frac{\sqrt{x+4}}{3}

Step-by-step explanation:

In order to find the inverse of the equation, we do a variable change, since we are finding the inverse, :

f(x)  = 9x^{2} - 4

y = 9x^{2} - 4

x = 9y' ^{2} - 4

Now solve for y'.

First add 4 in both sides of the equation and change to the left y'.

x + 4= 9y'^{2} - 4+4

9y'^{2} = x + 4

Second divide by 9

9y'^{2}/9 = (x + 4)/9

y'^{2} = (x + 4)/9

Now you will have to clear y, with the square root.

[tex]y'^{\frac{2}{2}} = \sqrt{x + 4}  / \sqrt{9}[/tex] =

Simplifying terms

y' = \frac{\sqrt{x+4}}{3}

f^{-1}(x)  = \frac{\sqrt{x+4}}{3}

You can check the answer by doing the evaluation of the following equation:

(f o f^{-1} ) (x)

substitute the equation for y' or inverse function f^{-1}

f(\frac{\sqrt{x+4} }{3})

Now substitue the value into f(x)

You will have

= 9(\frac{\sqrt{x+4} }{3}} )^{2}  - 4\\\\Solving\\\\9(\frac{{x+4} }{9}} )  - 4

=x

5 0
3 years ago
What could x be substituted for x 6x + -4 = 2x + 8
Rzqust [24]
6x-4=2x+8
mnus 2x both sides
4x-4=8
add 4 to both sides
4x=12
divide 4 both sides
x=3
6 0
3 years ago
Do any of you know how to easily and properly convert a mixed fraction to a decimal?​
arlik [135]

Answer:

Here's a 2 step conversion.

Step-by-step explanation:

1. Convert the fraction to a decimal: Divide the numerator by the denominator

2. Add this decimal number to the whole number part of the mixed number

A mixed number is a whole number plus a fraction. To find the decimal form of a fraction just divide the numerator by the denominator using a calculator or long division. Then add the decimal number to the whole number.

Example: Convert the mixed number 7 1/4 to a decimal

Convert the fraction to a decimal: Divide 1 by 4

1 ÷ 4 = 0.25

Add 0.25 to the whole number 7:

7 + 0.25 = 7.25

8 0
3 years ago
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Heyyyyyyyyyyyy helpppp
makvit [3.9K]

Answer:

its b

Step-by-step explanation:

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