Answer:
I solved part a
To solve this question, we need to solve an exponential equation, which we do applying the natural logarithm to both sides of the equation, getting that it will take 7.6 years for for 21 of the trees to become infected.
PART C
The logarithmic model is: g(x)= in x/0.4
We are given an exponential function, for the amount of infected trees f(x) after x years.To find the amount years needed for the number of infected trees to reach x, we find the inverse function, applying the natural logarithm.
Step-by-step explanation:
mark me brainliest!!
9514 1404 393
Answer:
Sydney is 45
Step-by-step explanation:
Let s represent Sydney's age. Then Devaughn's age is (s-14). The total of their ages is ...
s +(s -14) = 76
2s = 90 . . . . . . simplify, add 14
s = 45 . . . . . . . divide by 2
Sydney's age is 45.
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<em>Check</em>
Devaughn's age is 45 -14 = 31. Their age total is 45 +31 = 76, as required.
Answer: false
Step-by-step explanation:
Let <em>L </em>be the amount of hours that Kylie works on raking leaves and <em>W</em> the amount of hours that she works on cleaning windows (on a week).
Since she cannot work more than 30 hours a week, and the total time spent working is <em>L+W</em>, then:
![L+W](https://tex.z-dn.net/?f=L%2BW%3C30)
Since one month has 4 weeks, she should win $25 a week to earn $100 in a month. Since she gets paid $7 per hour for raking leaves, after <em>L</em> hours she would have won a total amount of <em>7L</em>, and since she gets paid $6 for cleaning windows, she would have won <em>6W</em> after <em>W</em> hours. The total amount of money earned would be <em>7L+6W, </em>which should be greater than 25:
![25\le7L+6W](https://tex.z-dn.net/?f=25%5Cle7L%2B6W)
Therefore, the system of inequalities that represents the situation, is:
You need to know the difference in change between .40 and 7.25, which is 6.85, then you divide the change in price by the original amount, so you do 6.85/.40, which is 17.125, then multiply by 100 to get percent and you get 1712.5% increase.