Answer:
C.
; 48 strands of bacteria
Step-by-step explanation:
Fred placed 3 strands of bacteria in a petri dish.
The bacteria strands double every hour.
Formula : y = ab^x
Where a is the initial value
b = growth rate
x = hours
So, A formula to represent how many bacteria strands are present at the nth hour : 
Now we are supposed to find how many strands of bacteria are present at 4 hours.
Substitute the value in the formula :
f(4)=48
Hence 48 strands of bacteria are present at 4 hours.
Answer:
15
Step-by-step explanation:
-6y-5
Substitute 1/2 for y.
-6y-5
-6(1/2)-5
-3(-5)
15
Kilo means 1000 so
2 kilograms = 2000 grams
10%=10/100=1/10
so 1/10 of 2000=200 grams or 0.2 Kilograms
Answer:
Square root of 81 is 9
Step-by-step explanation:
Answer:
We conclude that the physicists can change the temperature 20 hours.
Step-by-step explanation:
We know that a physicist must make sure that the temperature of metal at 0° C gets no colder than -80° C. The physicist changes the metal's temperature at a steady rate of -4° C per hour. We calculate how long can the physicists change the temperature. We get:
We conclude that the physicists can change the temperature 20 hours.
