Pls! 30 points! which of the following is a unit rate?
a. $1.25/ 4 oz.
b. 120 mi./ 2 hr.
c. 4 ft./ 1 sec.
d. 340mi./ 6 gal.

c. 4 ft./ 1 sec.

Step-by-step explanation:

A unit rate always requires the last unit a numerical value of 1.

So c is the answer because it is 4 ft per 1 sec or 4 ft/sec (4 feet per second)

More examples are: mph, kmph, g/cm² and etc.

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47