Answer:
C. 
Step-by-step explanation:
c
Answer:
The first option is the correct answer
Step-by-step explanation:
Use a=
r^2 (r represents your radius of 4 feet)
(4^2)
Answer = 16
^2
Patricia drove for 3 hours. Carlos drove for twice that, 6 hours. 6+3=9
scientist A dissolved 1 kg of salt in 3 litres.
scientist B dissolved 20 pounds of slat in 7 pint of water.
we know that 1 pound =0.543 g
20 pounds=9.07 kg.
1 pint=0.5 litres
so 7 pints =3.5 litres
so dissoving 1 kg of salt in 3 litres of water and 9.07 kg in 3.5 litres of water
we know that for concentration kg/l units is used .
for A= 1/3=0.33kg/l
and B=9.07/3.5=2.59 kg/l.
so scientist A has prepared more concentrated solution .
