I think the answer might be y=4
2000-$5
1000-$2.50
500- $1.25
250- $.62
2.50-$.06
F(4)=6(4) +3
= 24+3=27
F(4)=27.
A
B
=
C
D
---------------- already given
A
D
=
B
C
---------------- already given
and
A
C
=
A
C
---------------- common
Hence
Δ
A
B
C
≡
Δ
A
C
D
∴
∠
D
A
C
=
∠
B
C
A
- both opposite equal sides
D
C
and
A
B
, and
∴
C
D
||
A
B
- as alternate angles are equal
∴
∠
D
C
A
=
∠
C
A
B
- both opposite equal sides
A
D
and
B
C
∴
A
D
||
B
C
- as alternate angles are equal
As opposite sides of quadrilateral are parallel,
A
B
C
D
is a parallelogram.
Q
.
E
.
D
.
A square is a special case of a parallelogram, rectangle and a rhombus - they all have 2 pairs of parallel sides. A trapezoid cannot be classified as a square because it only has one pair of parallel sides