If i want to purchase a bike that cost $12 and is on sale for 25% off how much will the bike cost before tax

$9

Step-by-step explanation:

Step 1:  Find out what 25% of $12 is

  Multiply $12 by 0.25  (0.25 is 25% as a decimal)

     $12(0.25) = $3

     So the sale is for $3 off of the original price

Step 2:  Subtract $3 from the original price

      $12 - $3 = $9,

     So the price before tax will be $9

(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