Answer:
e ≥ 2w
Step-by-step explanation:
To make this easier, let us consider the case of Eliza being exactly twice as old as wendy
that would mean that twice the age of Wendy is the age of Eliza
e = 2w
but since she is AT LEAST twice as old as her, the age of eliza can be greater than twice of wendy and it might be equal to twice the age of Wendy
Hence, the symbol '=' will be replaced by '≥'
Hence, the correct relation is
e ≥ 2w
Answer: $130.68
Step-by-step explanation:
Total value = PRT/100
=1452 ×4.5 ×2 /100
=1452×9 /100
= 13068/100
= 130.68
To divide fractions just remember KFC
K: Keep (the first fraction)
F: Flip (the second fraction around)
C: Change (the divide symbol to multiplication)
2/7 ÷ 1/5
K
2/7 ÷ 1/5
F
2/7 ÷ 5/1
C
2/7 × 5/1
Multiply across
10/7
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
)