Answer:
18 miles driven in a week
Step-by-step explanation:
a unit rate is x/1, x being 18 miles and 1 being 1 week
The geometric mean of 2 & 200 is *(20)*
Answer: 
Step-by-step explanation:
We know that the standard quadratic equation is ax^2+bx+c=0
Let's compare all the given equation to it and , find discriminant.
1. a=2, b= -7, c=-9
So it has 2 real number solutions.
2. a=1, b=-4, c=4

So it has only 1 real number solution.
3. a=4, b=-3, c=-1

So it has 2 real number solutions.
4. a=1, b=-2, c=-8
So it has 2 real number solutions.
5. a=3, b=5, c=3

Thus it does not has real solutions.
3% x 10 years is 30%. 47 - 30% is 14.1 or 14