<span>If the intial count was 100,000 bacteria, after one hour 90% decrease => 10 % stands => 100,000*0.1 bacetria. After two hours 90% decrease => 10% stands => 100,000*0.1^2. After three hours, they stand 100,000 * 0.1^3. After four hours, 100,000*0.1^4 and after five hours 100,000*0.1^5 = 1 bacteria. Answer: 1 bacteria. If the inital count is different you just have to muliply the inicial count time (0.1^n) to get the number of bacteria after n hours, and if the number of hours is 5, then the factor is (0.1^5). </span>
Think how many triangles could you fit within the top of the area (vertex). So split the shape in half and you could atleast fit 4 triangles in it. So I would say 4+ maybe?
Exp.
100 $;
<span> discount of 20% => 80$;
</span> discount of <span>12%</span>% => 80 - 80*(12/100) = 71.4 $;
100 - (x/100)*100 = 71.4 => x = 29.6 => a single discount of 29.6%;
B because 6x4=24 and trust me pls
Let us assume the cost of the stereo to be = x
Percentage of sales tax paid by Amanda = 7%
Amount of sales tax paid by Amanda = $35
Then
7x/100 = 35
7x = 35 * 100
7x = 3500
x = 3500/7
= 500 dollars
So the cost of the stereo that Amanda bought was $500. I hope the procedure is clear enough for you to understand. Using this procedure, you can solve similar problems without requiring any help from outside.
