Can someone please answer this question please answer it correctly and please show work please help me I need it

C

Step-by-step explanation:

Question: 10 - 8 = 2

A = (-18)

B = 18

C = 2

D = (-2)

C  10 + (-8)

Step-by-step explanation:

10 - 8

We can add the opposite of a number.  The opposite of 8 is -8.  That is the same as subtraction.

10 + (-8)

(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

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).