exam Maths Puzzle Numerical Ability

I would really appreciate it if someone would please help me with this problem. Solve A=P+ PRT FOR A, given that P=$300,r=7%, and t=4 years.

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exam Other Question

Assume PQRS is a parallelogram.

1. If PQ = x^2-10 and SR = 3x, find all possible values of x.

2. If angle P = (x^2) and if angle Q = 11x, find all possible values of x.

3. i need to solve for y in this equation
thank you in advance

y+5-4y=-10