Answer:

Step-by-step explanation:
Calculate the length (d) using the distance formula
d = √ (x₂ - x₁ )² + (y₂ - y₁ )²
with (x₁, y₁ ) = (- 1, 3) and (x₂, y₂ ) = (0, 7)
d = 
= 
= 
=
≈ 4.1 ( to 1 dec. place )
Answer:
x = 20
y = 8
In a parallelogram, there are always two pairs of equal sides, where in this question:
Side CD = Side BA
Side DA = Side CB
Use this to find x and y.
CD = BA
15 = x - 5
x = 20 (rearranging to find x)
DA = CB
y = 8
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