7×3=21 so he has 7 more lawns or 2 1/3 months
Answer:
a. 
b. 
Step-by-step explanation:
First, we need tot find a general expression for the amount of caffeine remaining in the body after certain time. As the problem states that every hour x percent of caffeine leaves the body, we must substract that percentage from the initial quantity of caffeine, by each hour passing. That expression would be:

Then, to find the amount of caffeine metabolized per hour, we need to differentiate the previous equation. Following the differentiation rules we get:

The rate is negative as it represents the amount of caffeine leaving the body at certain time.
Answer:
<h2>10³ = 1000</h2>
<h3>∴ 1000 has 3 factors of 10.</h3>
Hope it will be helpful!!!
<h2>My Pleasure!!! </h2>
Answer:
i think its .625
Step-by-step explanation:
all you need to do to make a fraction into a decimal is divide the nominator by the denominator
Answer:
a^2-1
Step-by-step explanation:
(a+1)(a-1)
=a^2-1