B. 0.45
Step-by-step explanation:
Use a calculator.
cos 63° = 0.4539905
look a the sides they are perpendicular
option (b) is correct
step-by-step explanation:
to find the solution of this system, we need to convert it into reduced row-echelon form. we have,
after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,