Tim use 15 boards for each crate that he built which of the following expression is represents the total number of boards he would need to make n crates

(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

sounds & other waves originate from any vibrating object

d. you cannot tell because there are no values shown.

93-8=85

855=17

17*4=68

there are 68 purple marbles in that bag