When a quadratic equation ax^2+bx+c has a double root, the discriminant,
D=b^2-4ac=0
Here
a=2,
b=b,
c=18
and
D=b^2-4ac=b^2-4*2*18=0
solve for b
b^2-144=0
=> b= ± sqrt(144)= ± 12
So in order that the given equation has double roots, the possible values of b are ± 12.
Answer:
r=d÷2 is the right answer
Answer:
<em>total</em><em>=</em><em>n÷m</em><em> </em><em>$</em><em>1</em><em>6</em><em>5</em><em>÷</em><em>1</em><em>5</em><em>,</em><em>$</em><em>2</em><em>3</em><em>1</em><em>÷</em><em>2</em><em>1</em><em> </em><em>and</em><em> </em><em>$</em><em>2</em><em>7</em><em>5</em><em>÷</em><em>2</em><em>5</em>
Answer:
28.27 in²
Step-by-step explanation:
The area of a circle is dependent on only one variable: the radius:
A = πr²
If the radius is 3 inches, as you seem to indicate, then:
A = π(3 in)² = 9π in² = 28.27 in²
