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PilotLPTM [1.2K]
3 years ago
12

If 2= 3/4a+8 then a=? Show the steps of how u got the answer. If 5= -5+d divided by 3 then d=?

Mathematics
2 answers:
Kisachek [45]3 years ago
7 0
A=-8
Subtract 8 from both sides and you'll get -6=3/4a
Multiply 4/3 with both sides to get 4/3(-6)=a
Then -24/3 = -8
tiny-mole [99]3 years ago
6 0
A = -8. This is because if we subtract 8 from both sides, we have 3/4a = -6. Then, we multiply 4/3 to both sides (to isolate a). So now we have a = -8. d = 20. This is because if we divide both sides by 3, then we have -5 + d = 5. If we add 5 to both sides (to isolate d), then we have d = 20.
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now, we can plug value

P(t)=P_0(\frac{1}{2})^{\frac{t}{5730} }

an archaeologist in turkey discovers a spear head that contains 80% of its original amount of C-14

so,

P(t)=0.80P_0

we can plug it

0.80P_0=P_0(\frac{1}{2})^{\frac{t}{5730} }

now, we can solve for t

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