Find the value of y for a given value of x, if y varies directly with x.

if y = –0.09 when x = 0.9, what is y when x = 2.3?

a. –0.23

b. 23

c. –23

d .0.23

The answer is A because it X turns Y to a neg and back 1 decimal point. Only logical answer anyways...

D

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.