Steps:
1) 50 / .1 = 500
2) 500 * .25 = 125
Answer = 125
Answer:
8
Step-by-step explanation:
Area of a trapezoid can be found using the following formula:
A= base 1 + base 2 / 2 times the height
plug it in
A= 6 + 2/2 times 2
A= 8
<span> (2x+7)(2x+7) hope this helps</span>
Answer: It will take about 77 years (76.8 years).
Step-by-step explanation: Time is given by the equation: N=No.e^kt. You know that the concentration has to be 15% from the original so N=15 and No=100. To determine k, you have to look at the half-life. k=ln(0.5)/half-life time. For 28 years, k=-0.0247. Replacing it back into the N=No.e^kt equation, the answer will be 76.8 years.
