We can use the general term of the arithmetic series. Look:
Where:
: first term, 15.
: last term, 87.
n: number of terms (what we looking for);
r: reason, which is equal to the difference between two terms, that is, 3.
Let's go to the calculations.
There are 25 terms.
Answer:
The first choice; 76.3in^2
Step-by-step explanation:
The positive solution to the quadratic equation is x = 1.39
Given quadratic equation is
<em><u>The general quadratic equation is of form:</u></em>
Now comparing the general equation with the given equation we get
a = 2 , b = 3 and c = -8
<em><u>The formula to determine roots of the quadratic equation is:</u></em>
On plugging in vlaues, we get
On solving we get,
x = 1.39 OR x = -2.89
Hence , the positive solution to the quadratic equation is x = 1.39