Answer:
x=−3 or x=5
Step-by-step explanation:
x2−2x−15=0
Step 1: Factor left side of equation.
(x+3)(x−5)=0
Step 2: Set factors equal to 0.
x+3=0 or x−5=0
x=−3 or x=5
Answer:
Exponential
Step-by-step explanation:
<em>Starter:</em>
According to the title:
"Every day, half a bacteria population dies."
Exponential: y = ab^x ( b > 0 , b ≠ 1)
So the answer is C.
<em>Calculations:</em>
An exponential model is of the form y = a • b^t.
If you start with population of 500 million bacteria
t = 0
so 500 million = a • b^0 = a
Since every day half the population dies then in 1 day population will be 250 million
so a = 500 million, y = 250 million and t = 1
250 million = 500 million • b^1
b = 0.5
Therefore your equation would be
y = 500 million (or whatever the pop) • 0.5^t
Where t = number of days
This could also be written in exponential form ( e = 2.73)
If your PCR product size was 172 and there were 130 base pairs next to a 14 base pair repeat, then there are 3 repeats.
Given that the newly used primer amplifies 130 base pairs that are near
(a) 14 base pair and
(b) the size of the pcr product is 172
Size = (number of base pairs * number of repetitions) + Initial/Primer Amplicon Value
172 = (14 * x) + 130
172 -130 = 14x
42 = 14x
3 = x
Therefore, we can say that the PCR product has 3 repeats.
Learn more about PCR here
brainly.com/question/14050958
#SPJ4
G should be the correct answer
Hope this helps!
