-17
47
In the problem 2x-3 is 27, the x is equal to 15. Two times 15 is 30 and -3 is 27.
Yes, 15 + 15 = 30
First multiply 8e-15 by 6.022e23 to get the number of atoms and multiply that by 30 ( the number of hydrogen atoms)
10 explanation: from 60 to 30 you multiply by 1/2 from 30 to 20 you multiply by 2/3 from 20 to 15 you multiply by 3/4 from 15 to 12 you multiply by 4/5 from 12 to 10 you multiply by 5/6
-435
-30
By the uniqueness of numbers, there is no other number that is equal to 30.
15
0
50% of $30 is $15. The easiest way to do this is to just divide 30 by two, since 50% is half off.