Answer:
IS this IXL
Step-by-step explanation:
Any ways this should be slope so 2/7x+15 I think
Answer:
120
Step-by-step explanation:
Answer:
Step-by-step explanation:
0 1
3 3 ⟌ 6 4
- 0
6 4
- 3 3
3 1
Since x is the number of seconds it took the rock to hit the water, x is the value that we are looking for. When the rock hits the water, it's height is 0, therefore, f(x) = 0. So, we can set the expression on the right equal to 0, and solve for 0. Let's do just that:
![0 = -16(x^2-8x-9)](https://tex.z-dn.net/?f=0%20%3D%20-16%28x%5E2-8x-9%29)
We can divide by -16, nothing will happen because 0 divided by anything is 0:
![0 = x^2-8x-9](https://tex.z-dn.net/?f=0%20%3D%20x%5E2-8x-9)
To factor any trinomial in standard form (given below), we must find two numbers that add to "b" and multiply to "c":
![0 = ax^2 + bx + c](https://tex.z-dn.net/?f=0%20%3D%20ax%5E2%20%2B%20bx%20%2B%20c)
So, for this specific question, let's find two numbers that add to -8 and multiply to 9. These are clearly 9 and -1. We can write it in this way now:
![0 = (x-9)(x+1)](https://tex.z-dn.net/?f=0%20%3D%20%28x-9%29%28x%2B1%29)
Both answers would be valid, but there can't be negative time, so your answer is
"It takes 9 seconds for the rock to reach the water."
Answer: C
Step-by-step explanation: