Answer:

Step-by-step explanation:
=
We need a common denominator before we can add.
+
means the same thing as
-
= 
Answer:
3√5
Step-by-step explanation:
d = √(difference of x)² + (difference of y)²
d = √(7 - 4)² + (5 - (-1))² = √9 + 36 = √45 = 3√5
Answer:
Step-by-step explanation:
The two angles are formed from 2 intersecting lines. The angles are called vertically opposite angles. They are equal
4x + 21 = 85 Subtract 21
4x = 85 - 21 Combine
4x = 64 Divide by 4
x = 64/4
x = 16
Answer:
1/10
Step-by-step explanation: