Answer: 60
Step-by-step explanation:
To find the LCM of 12 and 15 you can list out the multiples.
The multiples of 12 are : 12, 24, 36, 48, 60, 72, 84, ....
The multiples of 15 are : 15, 30, 45, 60, 75, 90, ....
60 is the common multiple between the two numbers so therefore its the answer.
<em>(c) 53</em>
- Step-by-step explanation:
<em>Hi there !</em>
<em>we have a number ab</em>
<em>a + b = 8</em>
<em>ab - 18 = ba</em>
<em>10a + b - 18 = 10b + a</em>
<em>10a - a + b - 10b = 18</em>
<em>9a - 9b = 18 | + (9a + 9b)</em>
<em>9a + 9a - 9b + 9b = 18 + 9(a + b)</em>
<em>18a = 18 + 9×8</em>
<em>18a = 18 + 72</em>
<em>18a = 90</em>
<em>a = 90 : 18</em>
<em>a = 5</em>
<em>a + b = 8</em>
<em>5 + b = 8</em>
<em>b = 8 - 5</em>
<em>b = 3</em>
<em>ab = 53</em>
<em>Good luck !</em>
1/3-2/9
=3/9-2/9 Multiply 1/3 by 3/3 (1) to get common denominator to subtract
=1/9
2^x * 2 = 15
2^x= 15/2
2^x = 7,5
x = log 2 (7,5)
