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.
Answer:
Step-by-step explanation:
125.50
+ 75%= 94.12
125.50+94.12=219.62
Answer:
convex
Step-by-step explanation:
its convex because it has six outer perimeters
Answer:
26 times
Step-by-step explanation:
Given
Without Coupon
per trip
With Coupon

per trip
Required
The number of trips to be taken for both option (i.e. with or without coupon) to be equal
<em>See comment for complete question</em>
Let the number of trips in a month be x.
<u>Without Coupon</u>
Total amount is:


<u>Without Coupon</u>
Total amount is:


To get x, we simply equate both options

Collect like terms

