1 square kilometres = 100000000 square centimetres . express it in scientific notation

1.0x10

Step-by-step explanation:

Scientific notation is a number between 1-10 multiplied by 10 to the power of the amount of numbers following the first digit.

The first number in 100000000 is 1. Followed by 8 zeros.

1.0x10^8. the 1.0 is the first digit and the 8 comes from the zeros.

(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