Cramer's rule works as follows:
x+3y=16
3x+y=8
Then
x=Dx/D
y=Dy/D
where Dx,Dy,D are 2x2 matrices formed from of coefficients and right hand side.
D=
1 3
3 1
=1-9=-8
Dx=matrix D with first column replaced by the vector [16,8]=
16,3
8 1
=16-24
=-8
Dy=matrix D with second column replaced by the vector [16,8]=
1 16
3 8
=8-48
=-40
Therefore
x=-8/-8=1
y=--40/-8=5
Check:
x+3y=1+3(5)=16
3x+y=3(1)+5=8 ok.
Answer:
Brian will have £817.8
Step-by-step explanation:
Principal = £4700
interest = 5.5% = 0.055
n = 3 years
Amount = [(Principal * (1 + interest)ⁿ) - Principal]
Amount = [(4,700 * (1 + 0.055)³) - 4,700]
Amount = [(4,700 * (1.055)³) - 4,700]
Amount = [(4,700 * 1.174) - 4,700]
Amount = [5,517.8 - 4,700]
Amount = £817.8
1 mile = 5280 feet, so we multiply 6.25 by 5280 to get 33000 feet. 1 yard = 3 feet, so we divide 3 by 33000 to get 11000 yards.
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Hope this helps!
==jding713==
Hi,
Your answer would be B
Hoped I Helped
