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xz_007 [3.2K]
3 years ago
10

I'll give brainly <3 Please help with these questions <3

Mathematics
1 answer:
Naily [24]3 years ago
7 0
Difference would be 1000x3.0 - 8.8x10000 = -85000
Scientific notation would be 8.5x10^-4
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The sum of the digits of a certain two-digit number is 7. Reversing its digits increase the number by 9. What is the number?
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Let the two numbers be x and y.

According to your question;

x + y = 7
10y + x = 10x + y + 9

By equation 1 ; x = 7-y

Substituting the value of x ;

10y + ( 7 -y) = 10(7-y) + y + 9

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Substituting for x ;

x = 7 - y
=> x = 7 -4
=> x = 3

Thus, x = 3 and y = 4;
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