Answer:
8
Step-by-step explanation:
let the number=x
8(x-2)=16(x-5)
divide by 8
x-2=2(x-5)
x-2=2x-10
2x-x=-2+10
x=8
The half-life of the radioactive substance is 67.95 hours.
Answer:
d
Step-by-step explanation:
Answer:
i can't delete my answer but at first i thought it was just #7 but then i paid attention to the others and they all look like right triangles but idk fs sorry
Step-by-step explanation: