exam Maths Puzzle Numerical Ability

A beauty shop sells for $75,000 and a 22% down payment is made. A 20-year mortgage at 6.5% is obtained.
o Find the down payment.
o Find the amount of the mortgage. Find the

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exam Other Question
Solve for x algebraically: 5^(2x)- 4(5)^x=-3 I am trying to find the vertex for the following problem:

x^2+3x-4=0

All the help I could get would be appreciated.