Answer:
D. 1/2
Step-by-step explanation:
Because if you choose A , you get +4
if you choose B ,you get -12
Choose C , you get +20
D is the correct answer.
boat speed in still water = 20 mph
.
sin(30º) = 0,5
(5 x 4)= (3^2 - 4)= 4
(5 x 4)=20,
(3^2 -4)= (9-4)
(20)=(5)=4
20/5=4
4=4
