Use the fact that the quantity of a radioactive substance after t years is given by 
where 
is the original amount of radioactive material and k is its half-life (the number of years it takes for half the radioactive substance to decay).The half-life of strontium-90 is 25 years. Find the amount of strontium-90 remaining after 7 years if
src="https://sciemce.com/media/3/ppg__cognero__Chapter_00_Algebraic_Concepts__media__d827b24d-a45d-4335-8745-6e7002f63fdd.PNG" class="wirisformula" align="middle" style="vertical-align: middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_d8742b82809f4366887d890a9" />. Round your answer to one decimal place.
?
A. 8.1 kg
B. 79.1 kg
C. 5.8 kg
D. 116.6 kg
E. 0.8 kg
Answer: B
Mathematics
src="https://sciemce.com/media/3/ppg__cognero__Chapter_00_Algebraic_Concepts__media__d827b24d-a45d-4335-8745-6e7002f63fdd.PNG" class="wirisformula" align="middle" style="vertical-align: middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_d8742b82809f4366887d890a9" />. Round your answer to one decimal place.
?
A. 8.1 kg
B. 79.1 kg
C. 5.8 kg
D. 116.6 kg
E. 0.8 kg
Answer: B
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Graph the solution set of the system of inequalities.1 ? y < 8
A. 
B. 
C. 
D. 