Answer:
They are 12 and 9
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
)
Answer:
(5, -3)
Step-by-step explanation:
if x=2-y then 2-y-2y-11=0
-3y-9=0
-3y=9
y= -3
x= 2+3=5
C=m/3.
This equation is saying the cost (c) equals the minutes (m) on the phone out of 3 people
