(–23) – 45 – (–98) =–23 – 45 +98=-68+98=30
Answer:
The m∠ U is 72°.
Step-by-step explanation:
Given:

To find :

Solution:
The sum of the measures of the interior angles of a polygon with 'n' sides is given as

Here we have n = 5 on substituting the values we get

Therefore,
m∠ U is 72°.
The answer is 2 hours because from 5 to 7 the temperature was raising <span />