Answer:
A 21/4
Step-by-step explanation:
When forming a perfect square trinomial you need to "complete the square".
All of the steps to completing the square when solving an equation:
1. The leading coefficient must be 1.
2. Divide b by 2.
3. Square (b/2)
4. Add (b/2)^2 to both sides to keep the polynomial balanced.
5. You can now write the perfect square trinomial and solve.
x^2 - 3x
-3/2
(-3/2)^2 = 9/4 = 2 1/4
Answer:
There are 1,680 Girls
Step-by-step explanation:
1 ratio = 240
5 ratio = 1,200
7 ratio = 1,680
Therefore, 5:7 = 1,200 : 1,680
To solve for n, you are trying to get n by itself on one side of the equation.
n/5 + 0.6 = 2
Subtract 0.6 on both sides
n/5 = 1.4
Multiply 5 on both sides to get n by itself
n = 7
