jdaballer3009
27.08.2020 •
Mathematics
If a and b are two digits, then the following fraction
(ab0+ab0ab)÷(ab) -1 is equal to.
A.21 B. 1010
C. 110
D. 111
E. 1110
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Ответ:
B. 1010
Step-by-step explanation:
Simplify:
(ab0+ab0ab) ÷ (ab) - 1Note that:
ab = 10a +bab0 = 10* (10a + b) = 10abab0ab = 1000ab + ab = 1001 abTherefore:
(ab0+ab0ab) ÷ (ab) - 1 =(10ab + 1001ab) ÷ (ab) - 1 =(1011ab) ÷ (ab) - 1 = 1011 - 1= 1010Correct choice is B.1010
Ответ:
Yoko: 9 laps.
Felipe: 7 laps.
They both took 63 minutes to meet each other at the starting line.
Step-by-step explanation:
multiply 7 and 9 until they get the same answer.
7x9=63 Yoko finished 9 laps
9x7=63 Felipe finished 7 laps
The time they took to meet again is 63 Minutes.