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3 years ago

50% of Number is 250 what is 80% of that number

1 answer:

3 0

We have an equation: 250/?= 50/100

Cross multiply:
50*?= 250*100
⇒ ?= 250*100/50= 500

The number is 500~

We have another equation: ?/500= 80/100

Cross multiply:
100*?= 80*500
⇒?= 80*500/100= 400

80% of 500 is 400~

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1. 3x^2-7=31<br> 2. 2x^2+18=0<br> 3. 4x^2-26=-50<br> 4. 2x^2+36=x^2

yan [13]

The quadratic equations are solved and answered below -

<h3>What is a equation?</h3>

An equation is a mathematical statement showing the equivalence of two mathematical expressions. Example -

3x + 5 = 8

Given is -

3x² - 7 = 31

2x² + 18 = 0

4x² - 26 = - 50

2x² + 36 = x²

We have -

3x² - 7 = 31

3x² = 38

x² = 38/3

x² = 12.67

x = ±3.56

2x² + 18 = 0

2x² = - 18

x² = -9

x = ±3i

4x² - 26 = - 50

4x² = - 24

x² = -6

x = ±√6i

2x² + 36 = x²

x² = - 36

x = ±√6 i

Therefore, the quadratic equations are solved above.

To solve more questions on Rectangles and their Dimensions, visit the link below -

brainly.com/question/1041084

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4 0

1 year ago

A researcher wishes to estimate the proportion of X-ray machines that malfunction. A random 275 sample of machines is taken, and

Dominik [7]

Answer:

Following are the solution to the given question:

Step-by-step explanation:

$95\%$ Confidence Interval for both the percentage of all x-ray machines

p = the machinery's share is not working:

$= \frac{228}{275}\\\\ = 0.829$

$\text{Margin of Error} = Z_{(\frac{\alpha}{2})} \times \sqrt{( p \times (1-p)}{n})$

$= 1.96 \times \sqrt{(0.829 \times \frac{0.171}{275})} \\\\= 1.96 \times 0.023 \\\\= 0.045$

Lower $95\%$ Confidence interval = p - error margin $= 0.829 - 0.045 = 0.784$

Upper $95\%$ Confidence Interval = p + error margin $= 0.829 + 0.045 = 0.874$

So, $95\%$ Confidence Interval $= ( 0.78 , 0.87 )$

4 0

2 years ago

Find the value of x that makes the equation true 17 - 5(2x - 9) = -(-6x + 10) + 4

pogonyaev

Answer:

i think x=4.75

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

Solve for x. Write the reasons next to each step.<br> (2x - 6)<br> (x + 40)

solniwko [45]

Answer:

The answer for first one is,

$2(x - 3)$

sorry I don't know the answer for second one.

3 0

3 years ago

-12 - 6p - (-2) simplify

FromTheMoon [43]

Answer:

-6p - 10 or -10 - 6p

Step-by-step explanation:

-12 - 6p - (-2)

= -12 - 6p + 2

= -6p - 10 or -10 - 6p

Please mark me Brainliest :)

5 0

3 years ago

Read 2 more answers