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labwork [276]
3 years ago
12

Mathematicians use "..." to mean that a pattern continues: it

Mathematics
1 answer:
Fofino [41]3 years ago
6 0

Answer:

Step-by-step explanation:

We khow that A is the sum of all odd numbers that are less than 100

So A= 1+3+5+...+99

We can calculate this sum without adding all this numbers one by one

A = the number of terms *( first term + last one ) over 2

To get the number of terms we substract the first term from the last term then we add one

We khow that odd numbers are wiritten this way : 2*n +1 where n is an integer

So 99= 2*49+1

1= 2*0+1

So the number of terms is : 49-0+1 =50

So A= 50*(1+99)/2 = 2500

Foloowing the same method we get :

B= (49-1+1)*(2+98)/2= 2450

A>B

You might be interested in
Use the Commutative Property on the expression 7x - 5.
Schach [20]

Answer:

<h2>-5 + 7x</h2>

Step-by-step explanation:

The Commutative Property states that the order of addition or multiplication does not matter.

EXAMPLE 1 : 1 + 2 = 2 + 1 = 3

EXAMPLE 2: 3 x 4 = 4 x 3 = 12

It appears that we cannot use the commutative property on this expression. But we can. First, we need to change - 5 = + -5.

7x - 5 = 7x + -5

Because we now have addition, we can prove the commutative property.

-5 + 7x = 7x + -5

I'm always happy to help :)

4 0
3 years ago
I need help with 19. 20.21<br> My answers were<br> 19.4/96<br> 20.4/42<br> 21.2/72<br> Am I right
pashok25 [27]
19.(3/4)/(1/32)=24
20.(3/4)/(1/14)=21/2
21.(1/2)/(1/72)=36
3 0
3 years ago
Determine if the sides form a right triangle.
Law Incorporation [45]

Answer:

Yes, it's a right-angle triangle

Step-by-step explanation:

3 root 2 is 4.24

3 root 3 is 5.2

3 root 5 is 6.71

3 root 5 is the longest side, so must be the hypotenuse.

a^2 + b^2 = c^2

(3 root 3)^2 + (3 root 2)^2 = c^2

45 = c^2

Square root both sides

C = root 45

( simplified to C= 3 root 5)

Thus, it is a right-angle triangle.

(Root means a square root)

Hope this helps!

3 0
2 years ago
HALP ME WITH THIS MATH PLSS
pentagon [3]
The answer is 63/5ft long of the actual car. Hope this helps :)
8 0
3 years ago
Read 2 more answers
Round 24.5834 to 2 decimal places
weqwewe [10]

Answer:

24.58

Step-by-step explanation:

3 0
3 years ago
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