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3 years ago

List all prime numbers. between 10 and 20

Mathematics

2 answers:

Wewaii [24]3 years ago

6 0

Answer:

11, 13, 17, 19

Step-by-step explanation:

A) Find the prime #'s less than 30.

2, 3, 5, 7, 11, 13, 17, 19, 23, 29

2) See which #'s add and is less than 30 but, equal to 8.

17.

B) Find prime #'s between 30 & 60

31, 37, 41, 43, 47, 53, 59

2) See which #'s add and is add to 10.

37.

Leviafan [203]3 years ago

3 0

B it is between 30 and 60

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Tammy has 4 times as many books as Willy . Willy has 180 fewer books than Tammy . How many books does Willy have ?

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Vlad [161]

Answer:

The maximal area will be "1093.5 square feet".

Step-by-step explanation:

Let,

Length = L feet

Breadth = b feet

Given Total fencing = 162 feet

According to the question,

$(2\times L)+(3\times b)=162$

$2L+3B=162$

$L=\frac{162-3b}{2}$

$L=81-\frac{3}{2}b$

As we know,

$Area=Length\times breadth$

$=(81-\frac{3}{2}b)\times b$

$=81b-\frac{3}{2}b^2$

Now, we required to decrease or minimize the are. So for extreme points:

$\frac{dA}{db}=0$

or,

$\frac{dA}{dB}=\frac{d}{db}(81-\frac{3}{2}b^2 )=0$

$81-\frac{3}{2}\times 2\times b=0$

$b=\frac{81}{3}$

$b=27 \ feet$

Now on putting the value of b, we get

$l=81-\frac{3}{2}\times 27$

$=81-40.5$

$=40.5 \ feet\\$

So that the dimensions will be:

⇒ 40.5 feet by 27 feet

Therefore when the dimension are above then the area will be:

= $81\times 27-\frac{3}{2}\times 27\times 27$

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= $2187-1093.5$

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