Greetings.....
21-y
would be your algebraic expression...
Note.....If your wondering why its not y-21 instead, read below for clarification...
Up above it stated Y is less than...
What are they saying.. well, there basically saying the algebra variable ( in other words, the letter y) is LESS THAN 21.
Since its LESS than 21....221 is GREATER... So...
can you subtract y from 21 if its less?
NO
Can you subtract 21 from Y because y is less?
YES!
Hope this made sense!
~Queen Hanaenae
Answer:
In a quadrilateral ABCD, ∠A = 100°, ∠B = 105° and ∠C = 70°, find ∠D.
Solution:
Here the sum of the four angles
or, ∠A + ∠B + ∠C + ∠D = 360°
We know, ∠A = 100°, ∠B = 105° and ∠C = 70°
or, 100° + 105° + 70° + ∠D = 360°
or, 275° + ∠D = 360°
∠D = 360° - 275°
Therefore, = 85°
i hope this was helpful. <3
crown?
Answer:
this is grade what????
Step-by-step explanation: