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RUDIKE [14]
3 years ago
14

Can you prove it to please

Mathematics
1 answer:
mariarad [96]3 years ago
3 0
1) We find out the value of B

The only possible values than can take B, would be the number 5, because 3x5=15; the other values don´t end at 5. (2x3=6;  2 x 8=16).
Therefore:
B=5

2)We find out the value of D.
We compute:
3 * 7+1=21 +1=22

22 end at 2, therefore:

D=2

3)We find out the value of A
We compute:
3 x A+2=10 x C + 4
3A+2=10C+4
3A=10C+4-2
3A=10C+2

If we  multiply 3 x  A, the result end at 2, the only one number multiplied by 3, it end at 2 is the number 4, the other numbers don´t end at 4 (3 x 6=18, 3 x 2=6...). Therefore :

A=4

We find out the value of C.
3 x 4 +2=12+2=14,

14 is a number that it start with the number "1" (tenth ), therefore:
C=1

Answer: A=4;  B=5;  C=1 and D=2.
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The perimeter of the first figure is 34 cm and the area is 64 cm².
The perimeter of the second figure is 38 cm and the area is 60 cm².
The perimeter of the third figure is 30 cm and the area is 36 cm².
The perimeter of the fourth figure is 72 cm and the area is 200 cm².
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To find the perimeter of each, we add the area of all sides.  For the first figure, the missing sides are 1 cm and 6 cm.  To find the area, we have two rectangles whose dimensions are 6x10 and 1x4.

For the second figure, the missing sides are 4 cm and 3 cm.  To find the area, we have two rectangles whose dimensions are 4x12 and 3x4.

For the third figure, the missing sides are 3 cm, 3 cm and 8 cm.  To find the area, we have two rectangles whose dimensions are 4x3 and 3x8.

For the fourth figure, the missing sides are 10 cm, 10 cm, 6 cm and 6 cm.  To find the area, we have two squares whose dimensions are 10x10.

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