The equation will be of the form:

where A is the amount after t hours, and r is the decay constant.
To find the value of r, we plug the given values into the equation, giving:

Rearranging and taking natural logs of both sides, we get:


The required model is:
Answer:
michael ran 4.3 miles
Step-by-step explanation:
8.4-4.1=4.3
Step-by-step explanation:
9x+4=15
9x=15-4
9x=11
x=11/9 or 1 2/9
Answer:
The simplified ratio is<em> 7:6</em>
Step-by-step explanation:
First we have to find the <em>GCF</em> of <em>both 154 and 132</em>. Since the <em>GCF is 22</em>, we will <em>divide 154 by 22</em> and we get<em> 7</em>. Now <em>divide 132 by 22 </em>and we get <em>6.</em> Therefore, the simplest form or the ratio 154:132 is <em>7:6.</em>