Answer:
42
Step-by-step explanation:
sum the parts of the ratio, 5 + 6 = 11 parts
Divide the sum by 11 to find the value of one part of the ratio.
77 ÷ 11 = 7 ← value of 1 part of the ratio , thus
6 parts = 6 × 7 = 42 ← larger number
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Answer:
The time it'd take for the element to have 15 g of mass is approximately 68 min.
Step-by-step explanation:
The radioactive decay of a substance is given by the following formula:
Since the element has a half life of 12 minutes, this means that after this time the mass of the element will be half of it was originally, therefore:
Therefore the mass of the element is given by:
If the initial mass is 760 g and the final mass is 15 g, we have:
The time it'd take for the element to have 15 g of mass is approximately 68 min.Step-by-step explanation:
(a-b)(a+b) because when you reverse the sum you do axa and ax-b xx
