Grace's height and the tree's height are related by equivalent ratios
The height of the tree is 2.00 meters
Grace's height is given as:

When she measured the length of the tree's shadow, we have:
--- the length of her shadow
--- the length of the tree's shadow
The height (H) of the tree is calculated using the following equivalent ratio

Substitute known values

Express as fractions

Multiply both sides by 1.65

Simplify

Hence, the approximated height of the tree is 2.00 meters
Read more about equivalent ratios at:
brainly.com/question/13513438
I think none of them but I’m not sure.
Answer:
0.00003mm
Step-by-step explanation:
We know that 1mm=1000000nm
To convert small unit to big we divide
So 30÷1000000=0.00003nm
We know, Tanx = sinx / cosx
Tan 90 = sin90 / cos 90
Tan 90 = 1/0
As zero is in the denominator, it can't be defined.
In short, Your Answer would be: "False"
Hope this helps!