During radioactive decay, the number of atoms of the decaying substance decreases by approximately the same percentage per unit of time. Approximately 8% of the radioactive isotope iodine-131 present at the beginning of the day decays each day. Calculate the half-life of iodine-131!
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Loading...60% of the 25 students in a class are girls. Nine owns. Schoolgirls have a pet, while among boys every fifth one has a pet Create a four-field table with absolute values How many boys have a pet? What percentage of the children in the class own a pet? A child without a pet is…
The curve analysis task is: f(x) = 3x to the power of 4 + 10x to the power of 3 – 8x to the power of 2. Can someone calculate the intersection point of f with the axes and explain the steps? Thanks in advance.
(1) 2-r=s (2) 1+2r=4-s (3) 4+r= 2+3s Gladly with calculation method.
2(1+a)+4(1+2a)+5(2,5a)=d I got a=-6:22.5, but that is wrong please with calculation method
I don't understand how to calculate this. We probably need to apply the Pythagorean theorem somehow. I've tried several times, but I'm missing something. Thank you very much.
Iod(t) = 0,92^t
Iod(t) = 0.5, dissolve after t for the answer in days.