Lizzie has 60 dollars in her bank. She takes out 8 dollars every week. After a few weeks she had 28 dollars. How many weeks did it take for her to reach 28 dollars?
Answer:
4x10^6
9x10^8
1.7x10^9
2.7x10^10
6.2x10^9
Step-by-step explanation:
I hope this is correct
Answer:
n= -45
Step-by-step explanation:
5+n=10-50
First simplify by solving 10-50:
5+n=-40
Then subtract 5 from both sides:
n=-40-5
Then we have our answer:
n=-45
Answer:
2,4,5
Step-by-step explanation:
The straight line has representation:
y=kx+n, where k and n are real numbers. We dont have ^2 or any other operation.
So:
1. Is not line because yx=9x-1
2. X=16+3y we can write like y=1/3X-16/3 so it is straight line TRUE
3. Ve have ^2 it is not staight line
4.8x-5y=30 is y=8/5x-6 it is line TRUE
5.y=-6(x+10)=-6x-60 it is line TRUE
6. Y=x(3-x)+1=3x-x^2+1 so we have ^2 it is not straight line.
y = ax^2 + 10x + 1
For our graph, y = 0 whenever it crosses the x-axis, so we must solve:
0 = ax^2 + 10x + 1
Using the quadratic formula:
[-10 ± sqrt(100 - 4a)]/(2a)
In order to have two distinct roots, our square root part of the answer above must be a real number that is not zero. In other words:
100 - 4a > 0
Because if the value underneath the square root symbol is negative, we will have no solution, and if the value underneath the square root symbol is zero, then we will only get one solution.
So solve:
100 - 4a > 0
100 > 4a
25 > a
So a must have a value lower than 25. Also note that when a = 0, we have a linear equation which only has one solution that crosses the x-axis, so we must exclude a = 0 as well.
So the answer is:
a < 25, where a ≠ 0