Hey there!
To start, this is an exponential, meaning your equation should be in this format:
y=a(1±b)^x where a is the principal amount, b is the rate, and x is the years passed. If b is a decrease rate, you would subtract it from one, and if it is an increase rate, you would add it to 1. In this case, the rate 5.5% is a decrease rate so you would perform 1-5.5% or 1-0.055 which would be 0.945.
Now, plug in your known values:
y=3900(0.945)^15
Finally, simplify to get:
y=1669.33
Now, round to the nearest whole number (you can't have a decimal of a tree) to get 1669 trees after 15 years.
Answer:
<ECF = 45 degrees
Step-by-step explanation:
If ABCD is a square, then the diagonal AC divides angle <C and angle <A in two equal parts. Angles A and C are also 90 degrees each due to the act that the figure is a square. Therefore their bisection would render 90/2 = 45 degrees.
Notice as well that angle <ECF is opposite by the vertex to one of these 45 degree angles, and then it must measure the same amount (45 degrees).
So, <ECF = 45 degrees
34ft squared is the answer
If you would like to know the height of the tree 10 years from now, you can calculate this using the following steps:
h ... the height of the tree 10 years from now
h = 30 feet + 5 feet = 35 feet
The correct result would be D. 35 feet.
What does x equal? In order to find the relationship between x and y we need to know both values at a given instance. For example, if x = 10 while y = 20/3, then we know that you = 20x/30 or 2x/3.