book Maths Puzzle Numerical Ability

Write and solve an equation to answer the question.... all i need help on is the order of what to subtract,add etc....

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book Other Question

Ok this is the instructions:
Find the degree of the polynomial.
Here is the problem:
Arrange the terms of y^4x+y^5x^3-x^2+yx^5 so that the powers of x are in ascending order.
How do i do this?
Thanks in advance! What is the current price of a 2-year 7% bond with annual coupons and a face value of $1,500?