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Earn +20 ptsQ: 10b - 9 if b 2?
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What value 10b when b 9?
If b = 9 then the value of 10b is 90
Find the digits of a two digit number whose sum is 7 and the number increases by nine when the digits are transposed?
The number is 34 a + b = 7 a = 7 − b 10a + b + 9 = 10b + a 10(7 − b) + b + 9 = 10b + 7 − b 70 − 10b + b + 9 = 9b + 7 72 = 18b 4 = b 3 = a
What is b plus 9b?
10b
If a number consists of two digits which add up to nine and when the digits are reversed the original number is decreased by forty five then what was the original number?
72 1) a+b=9 2) ab-ba=45==> 10a+b-(10b-a)=45==>9a-9b=45==>a-b=5 per (1) and (2) a+b+a-b=9+5 ==> 2a=14==>a=7 per (2) a-b=5==> b=2 ab=72; ba=27
What is 10a x 10b equal to?
9
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