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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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<u>3/4</u>  =  1/2  +  1/4

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7 0
2 years ago
For every 2 hours that Robert spends studying for a math test he spends 3 hours working on English. If he spends 21 hours one mo
nataly862011 [7]

Answer:

31.5 hours studying English

Step-by-step explanation:

2 math hours  = 3 english hours

21 math hours = ? english hours

21/2 = 10.5

10.5 * 3 = 31.5

5 0
3 years ago
Basher collected 4 1/3 basket of peaches and Orchard if each basket holds 21
miv72 [106K]
To do this you times 3 by 4 and add it on to the numerator of the fraction, to turn it into a top heavy fraction:
3*4 = 12
1+12/3 = 13/3

Then you multiply the numerator by 21 to work out what 21 times the fraction is:
13*21/3 = 273/3

Then you can divide 273 by 3 to get the final answer:
273/3 = 91

He will have 91 peaches overall.
Hope this helps! :)
6 0
3 years ago
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lukranit [14]
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3 years ago
Expand and simplify 9 (x-y)^2-9(x+y)(x-y)
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To simplify the problem it would be: -18xy+18y^2

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