Blake has a collectors' card that he bought for $42.00. The card is now worth $87.00. What is the percent of change in the value
1 answer:
You might be interested in
Answer:
A
Step-by-step explanation:
Recall that for a quadratic equation of the form:
The number of solutions it has can be determined using its discriminant:
Where:
- If the discriminant is positive, we have two real solutions.
- If the discriminant is negative, we have no real solutions.
- And if the discriminant is zero, we have exactly one solution.
We have the equation:
Thus, <em>a</em> = 2, <em>b</em> = 5, and <em>c</em> = -<em>k</em>.
In order for the equation to have exactly one distinct solution, the discriminant must equal zero. Hence:
Substitute:
Solve for <em>k</em>. Simplify:
Solve:
Thus, our answer is indeed A.
Answer:
( 1 = sin² + cos²)
Step-by-step explanation:
Answer:
Explanation:
Rewrite:
=
Expand
=
Expand
=
Mordancy.