1. The commutative property is not true for addition.
3 is not equivalent to -3, however it is the exact opposite of 3 I hope this helped ^^
The trigonometry ratio that we shall use to solve the question will be:
tan θ=opposite/adjacent
where:
opposite=8.9 cm
adjacent =x cm
θ=55°
plugging the values and simplifying we obtain:
tan 55=8.9/x
thus
x=8.9/tan55
x=6.23 cm~6.2 cm
Answer: A
9,374 rounded to the nearest thousands place is 9,000