Answer:
f=82.4
Step-by-step explanation:
f=9c/5+32
f=9x28/5+32
f=252/5+32
f=50.4+32
f=82.4
Answer:

Estimated
Step-by-step explanation:
Well we know the algae doubles three times.
So take 50 x 2 = 100
take 100 x 2= 200
200 x 2 = 400
So the answer is A
Y=2x+5
goes up by 2, which is the gradient and 5 is the y intercept