3 because 4×3=12 and if you divide12÷3/4 it helps you check
Step-by-step explanation:
the process is show in the above picture.
19 ÷ 25= 0.76
0.76 ⇒ 76%
She got a C on the test.
Hoped this helped.
~Bob Ross®
Answer:
x-intercept:
A line that crosses the graph at x-axis.
i.e substitute y = 0 and solve for x.
As per the statement:
A biologist created the following graph to show the relationship between the temperature of water (x), in degrees Celsius, and the number of insect larvae (y) in the water
Given the graph:
![y = -2x^2+20x+400](https://tex.z-dn.net/?f=y%20%3D%20-2x%5E2%2B20x%2B400)
Substitute y = 0 we have;
![-2x^2+20x+400 = 0](https://tex.z-dn.net/?f=-2x%5E2%2B20x%2B400%20%3D%200)
⇒![-2(x^2-10x-200) = 0](https://tex.z-dn.net/?f=-2%28x%5E2-10x-200%29%20%3D%200)
⇒![x^2-10x-200 =0](https://tex.z-dn.net/?f=x%5E2-10x-200%20%3D0)
⇒![x^2-20x+10x-200 =0](https://tex.z-dn.net/?f=x%5E2-20x%2B10x-200%20%3D0)
⇒![x(x-20)+10(x-20)=0](https://tex.z-dn.net/?f=x%28x-20%29%2B10%28x-20%29%3D0)
⇒![(x-20)(x+10)=0](https://tex.z-dn.net/?f=%28x-20%29%28x%2B10%29%3D0)
By zero product property we have;
x-20 =0 and x+10 = 0
⇒x = 20 and x = -10
Therefore, the x-intercept represents the water has no larvae at −10 degrees Celsius and 20 degrees Celsius.