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Darya [45]
3 years ago
12

Omar broke a cell sample into 8 batches, each

Mathematics
1 answer:
Nady [450]3 years ago
7 0

Step-by-step explanation:

we have 8 equally "heavy" batches.

one weighs 3.9 × 10^-10 g

so, the total sample then weighed

8 × 3.9 × 10^-10 = 31.2 × 10^-10 = 3.12 × 10^-9 g

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Which equation has the solutions x = 1+
BaLLatris [955]

Answer:

The last equation x2 - 2x -4 = 0

has solution  (x - 1)^2 - 5 = 0,   x  =  1 + root(5)  or  x = 1 - root(5)

Step-by-step explanation:

If a quadratic function has roots 1 and 5

f(x) = (x -1)(x- 5)

f(x) = x^2 - 6x + 5

Unless you meant.  -4 and 6  ?

g(x) = (x + 4)(x - 6)

g(x) = x^2 -2x -24

-------------------------

Or did you mean  x = 1 and x =4 ?...

x^2 + 2x + 4 = 0  :   complete square  x^2 + 2x + 1 + 3 = 0,   (x+1)^2 + 3 = 0

x^2 - 2x + 4 = 0 :  complete square:  (x -1)^2 + 3 = 0

0x^2 + 2x - 4 = 0,    2x - 4 = 0,  x = 2

x^2 - 2x - 4 = 0  becomes:   x^2 - 2x + 1 - 1 -4 = 0 ;  (x - 1)^2 - 5 = 0

5 0
4 years ago
The salution X=6 is a solution of which of the following 5X =1, 3= 15X,- 4X=-20, 60=10 X
frosja888 [35]
60 = 10x
60/10 =x
6 = x
7 0
4 years ago
Whoever helps gets brainliest!
lisov135 [29]
<h3>Answer:</h3>

4 miles per hour

<h3>Step-by-step explanation:</h3>

Unit rate is the rate of something per 1 unit. In other words, the unit rate is x units per 1 unit. In this situation, the unit rate is how many miles Hassan walks in 1 hour.

Proportion

First, to find the rate of anything we can set up a proportion. In the question, the rate is described as miles per hour, so the miles will be the numerator and the hours will be the denominator.

  • This creates the proportion \frac{12miles}{3hours}

So, the rate we are given is 12/3.

Unit Rate

To find the unit rate we need to make the denominator equal to 1. To do this, divide both the numerator and denominator by 3.

  • 12/3 equals 4
  • 3/3 equals 1

So, this means that the new proportion is 4/1. Next, we can add our units, which means that Hassan walks 4 miles per 1 hour.

Graph

Now we can resize the bar graph. The purple bar should be set to 4 because this represents the miles. Then, the green bar should be set to 1 because it represents the hours.

4 0
2 years ago
Read 2 more answers
The mean of the numbers 22,18,(2y+1),10 and 20 is 15. <br>find the median.​
andrezito [222]

Answer:

Median is 18

Step-by-step explanation:

Firstly you have to fine y by using your mean

Therefore, 22+18+(2y+1)+10+20 divide it by the number of the mean that is the sum of the number divide by the total number of the mean which is 5 =15

22+18+2y+1+10+20 over 5 =15

71+y over 5 =15

Cross multiple

71+y=75

y=4

22,18,9,10, 20

Rearrange

9,10,18,20,22

The median is 18

Pls mark answer as brainliest

4 0
3 years ago
Solve the equation for the indicated variable.<br> А= 1/2bh for b
Eduardwww [97]
A = 1/2bh

Divide h by both sides.

A/h = 1/2b

Divide 1/2 by both sides.

b = 2a/h

4 0
3 years ago
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