You put $400 in an account. The account earns $18 simple interest in 9 months. What is the annual interset rate

answer:

.5 or 5%

Step-by-step explanation:

Use the simple interest rate formula I/PT = R, I is your interest which is 18 and P is the original price which is 400 and then T is your time/period which is 9 if you put those numbers in you get 1/200 then you multiply that by a hundred and you get .5 to check your work use this formula I = Prn and r is your rate which is .5 and you get 1,800 you divide that by 100 and you get 18. Hope this helps and is not too late :)

(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