Answer:x=-1
Step-by-step explanation:
Given:
The quadratic equation is:

To find:
The solutions of the given equation.
Solution:
We have,

Splitting the middle term, we get



Using zero product property, we get
and 
and 
Therefore, the solutions of the given quadratic equation are -6 and 5.
Umm? What do you mean by this
after 8 hours there are 995 bacteria cells left
let y be the amount after 8 hours
the multiplying factor is 100 - 5 = 95 % = 0.95
y = 1500 ×
= 995
(74 + 78 + 70 + x) / 4 = 80
Divide each number by 4.
18.5 + 19.5 + 17.5 + x = 80
Add the numbers you know so far.
18.5 + 19.5 + 17.5 = 55.5
You need 24.5.
Now, since we divided all the others by 4, we have to multiply 24.5 by 4 to see what the exam score would be.
24.5 * 4 = 98.
To get an average of 80%, the student would need to get a 98 on their fourth exam.