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hram777 [196]
3 years ago
12

X + Y is equal to 5 x minus Y is equal to 4 find the value of find the value of x square minus y square ​

Mathematics
1 answer:
Grace [21]3 years ago
7 0

Answer: 20

Step-by-step explanation:

x+y=5

x-y=4

---------

x+y=5

x=4+y

--------

(4+y)+y=5

4+y+y=5

 4+2y=5

      2y=1

        y=0.5

        x=4.5

---------

x²-y²=(4.5)²-(0.5)²=20.25-0.25=20

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Which property of real numbers is shown below? 3 + ((-5) + 6) = (3 + (-5)) + 6 commutative property of addition identity propert
Sati [7]

Answer:

The correct answer is the associative property of addition.

Step-by-step explanation:

This property states that no matter which way we group things when adding, they will still create the same outcome. Since all of the symbols are addition, the answer is the same.

5 0
3 years ago
Read 2 more answers
2t+8&gt;-4(t+1)<br> T&gt;___<br> **The sign is meant to be more than or equal to.**
Mrrafil [7]
<span>2t+8>-4(t+1)
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8 0
3 years ago
Please answer the following questions​
shutvik [7]

Answer:

a) 8.8 square centimetres

b) 31.8 square centimetres

c) (3a + 12) square centimetres

d) Area = (2b + 2c + 4) square centimetres

Step-by-step explanation:

a) We have to split the diagram into three separate rectangles as shown below.

The area of A:

Area = 5.3 * 1 = 5.3 square centimetres

The area of B:

Area = 3.3 * 1 = 3.3 square centimetres

The area of C:

Area = 2 * 1 = 2 square centimetres

The area of the shape is the sum of the areas of the three shapes:

Area = 5.3 + 3.3 + 2 = 8.8 square centimetres

b) We have to split the diagram into two separate rectangles as shown below.

Note:(The diagram has conflicting values for 2.6 and 2.1 but I went with 2.6 as it seems more feasible in the diagram)

The area of A:

Area = 3 * 2.6 = 7.8 square centimetres

The area of B:

Area = 6 * 4 = 24 square centimetres

The area of the shape is the sum of the areas of the two shapes:

Area = 7.8 + 24 = 31.8 square centimetres

c) The shape is a rectangle and so its area is:

Area = 3 * (a + 4) = (3a + 12) square centimetres

d) The shape is a trapezium and so its area is:

Area = 0.5(A + B)H

where A =  c cm

B = b + 2 cm

H = 4 cm

The area of the shape is therefore:

Area = 0.5 * (c + b + 2) * 4

Area = 2 * (b + c + 2)

Area = (2b + 2c + 4) square centimetres

3 0
2 years ago
Altitudes are congruent segments true or false
Snezhnost [94]
Not true, at least not always. When we are talking about an isosceles triangle there will be two equal altitudes and one is different. In case of a regular triangle all the other three altitudes have equal length! :)
6 0
3 years ago
What’s the ratio decimal of<br> 2:3 <br> 3:7<br> 3:6<br> 3:8<br> 2:5<br> 3:7<br> 2:4
konstantin123 [22]
To find the ratio decimal form, write each ratio as it's corresponding fraction, then divide. Simplify fractions, if possible.


2:3= 2/3= 0.6666666= 0.67 rounded

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3:6= 3/6= 1/2= 0.5

3:8= 3/8= 0.375

2:5= 2/5= 0.4

3:7= 3/7= 0.42857= 0.43 rounded

2:4= 2/4= 1/2= 0.5


Hope this helps! :)
6 0
3 years ago
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