Answer:
Y=-5/9X+7
Step-by-step explanation:
Answer:
4 d
Step-by-step explanation:
Given D is mid-point of BC and AD⊥AC
From right angle △DAC
cosC=
a/2
b
=
a
2b
...(i)
also from cosine formulae
cosC=
2ab
a
2
+b
2
−c
2
...(ii)
From (i) and (ii) we get
a
2b
=
2ab
a
2
+b
2
−c
2
⇒4b
2
=a
2
+b
2
−c
2
⇒b
2
=
3
a
2
−c
2
∴cosAcosC=
2bc
b
2
+c
2
−a
2
.
a
2b
=
ca
[(
3
a
2
−c
2
)+c
2
−a
2
]
=
3
2
(
ca
c
2
−a
2
)
To find this you know that the A of a square = s^2
So the length of one side equals

Since this is a perfect square, it would equal

And

Also you know it is a perfect square because the first and last terms are perfect squares :) :D
Answer: a+-5 x 4 (I THINK)
Step-by-step explanation:
Answer:
8
Step-by-step explanation: