30 because 5and 10 have a least common multiple of 20 but including 15 it is 30 since 15 and 10 are the only important numbers
2m - 6 = 8m
2m - 6 - 2m = 8m - 2m
2m - 2m - 6 = 8m - 2m
-6 = 6m
-6/6 = 6m/6
-1 = m
-1(3) = m(3)
-3 = 3m
3m = -3
These are the correct answer
What would you like help with?
Remember
(ab)/(cd)=(a/c)(b/d)
and

1kg=1000g=1*10^3g
hmm, I estimate, 4 of them
x=number of attoms
mass of 1 times x=1*10^3
3.95*10^-22 times x=1*10^3
divide both sides by 3.95*10^-22
x=

=

=

a million has 9 zeroes
so 24 zeroes is alot that is a <span>septillion, so there are 2.5316 septillion uranium atoms in 1kg
a. 4
b. underestimate
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