Iodine-131 has a half-life of approximately 8 days. Find the amount ofiodine-131 left from a 100-gramsample after 40 days. Use ALL numbers after the decimal place.

the answer is 21%.

answer: b

step-by-step explanation: im sorry bro bro but thats not a eqation the human mind can answer and plus im a devil

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.