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SVETLANKA909090 [29]
3 years ago
8

Determine if the following are properties write y or n for each

Mathematics
1 answer:
Paul [167]3 years ago
4 0

Answer:

Answers are below

Step-by-step explanation:

5+1=6       No

78+6=76+8    Yes, commutative property of addition

2x+(3x+4x)=(2x+3x)+4x     Yes, associative property of addition

52+(-18)=(-52)+18     No

6+(-6)=0    Yes, identity property of addition

If these answers are correct, please make me Brainliest!

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What is the perimeter of khgj?
kaheart [24]

Answer:

  58 in

Step-by-step explanation:

The fact that the rectangles are congruent means both have a length of 18 in and a width of 11 in. The perimeter is ...

  P = 2(L +W)

  P = 2(18 in + 11 in) = 2(29 in)

  P = 58 in

The perimeter of KHGJ is 58 inches.

3 0
2 years ago
An interior angle of a regular polygon has a measure of 135° how many sides does it have
butalik [34]

8 sides

the exterior angle = 180° - 135° = 45° ( exterior/ interior are supplementary )

the sum of the exterior angles of a polygon = 360°

number of sides = \frac{360}{45} = 8


6 0
3 years ago
If<br> 21 = 42<br> 39 = 618<br> 17 = 214<br> then what does<br> 45 = ?
Brums [2.3K]

Answer:

810

Step-by-step explanation:

21 = 42

Decode:

Number in the tens place = 2 x 2 = 4

Number in the ones place = 1 x 2 = 2

Answer: 42

39 = 618

Decode:

Number in the tens place = 3 x 2 = 6

Number in the ones place = 9 x 2 = 18

Answer: 618

17 = 214

Decode:

Number in the tens place = 1 x 2 = 2

Number in the ones place = 7 x 2 = 14

Answer: 214

Find 45

Number in the tens place = 4 x 2 = 8

Number in the ones place = 5 x 2 = 10

Answer: 810

3 0
2 years ago
Determine the area of the triangular ABC with AC =5cm and height DB=30mm​
seropon [69]

Answer:

Step-by-step explanation:

AC² = AD² + DB ²

25 = AD² + 9

AD²= 25 - 9

AD² = 16

AD = 4

Area = 4*3 /2

= 6cm

4 0
3 years ago
Find the slope of the horizontal line that passes through the points (5,3) and (8,3)
elena-14-01-66 [18.8K]
The slope is 0 the equation of the line is y=3
6 0
3 years ago
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