Answer:he can read 1 and 3/12 or 15/12 books in an hour.
Step-by-step explanation:
the answer is D I'm pretty sure!!
All the measures in a triangle are equal to 180 degrees.
Let the unknown angle= x.
40+89+x= 180
Combine like terms.
129+x= 180
Subtract 129 from both sides.
x= 51
The angle is equal to 51.
I hope this helps!
~kaikers
