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fenix001 [56]
3 years ago
13

The numbers of students in the four sixth-grade classes at Northside school are 26,19,34 and 21. Use properties to find the tota

l number of students in the four classes.
Mathematics
1 answer:
san4es73 [151]3 years ago
6 0
Basically there are 3 addition properties and they are associative property, identity property, and commutative property. 

Commutative property is just changing the order of the addends. Example: 26+19+34+21= 21+34+19+26

Identity Property is just adding a 0 to the number that doesnt change anything. Example: 26+19+34+21 +0 = 100

Associative property is just changing the grouping of the addends. Example: (26+19) + (34+21) 
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What is 3x+2x(x-1)=9x+4
Korvikt [17]
3x+2(x-1)=9x=4
We move all terms to the left:
3x+2(x-1)-(9x)=0
We add all the numbers together, and all the variables
-6x+2(x-1)=0
We multiply parentheses
-6x+2x-2=0
We add all the numbers together, and all the variables
-4x-2=0
We move all terms containing x to the left, all other terms to the right
-4x=2
x=2/-4
x=-1/2
5 0
3 years ago
Please can you help me
Aleks [24]

9514 1404 393

Answer:

  x = 5

Step-by-step explanation:

In a parallelogram, the diagonals bisect each other. This means ...

  PQ = PS

  2x +15 = 5x

  15 = 3x . . . . . . subtract 2x

  5 = x . . . . . . .  divide by 3

8 0
3 years ago
One card is selected at random from a deck of card. Determine the probability that the card selected is not a 4
Ganezh [65]

Answer:

12/13

Step-by-step explanation:

A probability is the number of desired outcomes over the total number of outcomes.

Assuming that this is a standard deck of playing cards, there will be 52 cards, and there will be 4 "4" cards.

First, find the number of desired outcomes, and put it over the total number of outcomes.

Out of the total number of outcomes (52), there are 4 outcomes that are not wanted, hence the equation is:

52 - 4 = 48

So out of the 52 possible outcomes, 48 are desired. Set up the fraction and

simplify:

48/52

/4   /4

= 12/13

7 0
3 years ago
A triangular prism has a volume of 2500 cubic feet. What is the length of the prism if its triangular bases are right triangles,
seraphim [82]

Answer:

25 ft

Step-by-step explanation:

V = AH, where A = area of the base, and H = height (length) of the prism

A = bh/2 for a triangle

V = bh/2 × H

2500 = (10)(20)/2 × H

2500 = 100H

H = 25

Answer: 25 ft

5 0
2 years ago
The amount $180.00 is what percent greater than $135.00? 
sergiy2304 [10]

Answer:

Its Option C

Step-by-step explanation:

The difference is 180 - 135 = $45

So  it is 45 * 100 / 135  

= 33.33% greater

4 0
3 years ago
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