Let's find all the prime numbers.
1,3,5,7,9,11,13,15,17,19
They are not divisible by 2.
Put that into a fraction, where the amount of numbers is the numerator and the total amount of numbers is the denominator.
10/20
That is half of 20.
So, 50% of the 20 first natural numbers are prime.
I hope this helps!
~cupcake
Hello.
First, let the number be r.
5 times r is written like this:

Now, add 45:

Now, the sum of 5r+45 is equal to the sum of 85 and 140:

In order to solve this equation, we need to add 85 and 140:

Now, subtract 45 from both sides:



The last step is to divide both sides by 5:

Therefore, the answer is

I hope it helps.
Have a nice day.

Answer:
It's 15
i took the test
Step-by-step explanation:
Answer:
x = 9
Step-by-step explanation:
1/4(8x+12) =21
1/4 * 8x = 2x
1/4 * 12 = 3
2x + 3 = 21
21 - 3 = 18
2x = 18
18/2 = 9
x = 9
Juan has<span> $</span>c<span>$ </span>cheesecakes<span>. </span>Clarence has 5 less than 3 times<span> as </span>many cheesecakes<span> as</span>Juan has<span> and </span>Darlene has 2 more than half<span> as </span>many cheesecakes<span> as </span>Clarence has<span>. </span>Find<span> an </span>expression<span>in </span>terms<span> of $</span>c<span>$ for the </span>total number<span> of </span>cheesecakes Juan<span>, </span>Clarence<span>, and </span>Darlene have<span>. Z K Y. The post below </span>