exam Maths Puzzle Numerical Ability

x+y+z=4
2x+y=7
4x-y+3z=-7

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exam Other Question

Can anyone help with this problem. Any help would be great. thanks.
sqrt10(sqrt x + sqrt 20) The cost of a new car is $19,000. You can finance the car by paying $500 down and $400 per month for 60 months.
A) Determine the amount financed.
B) Derermine the total installme