exam Maths Puzzle Numerical Ability

Question 72 on page 63
Represent each quantity with a real number.
A country exported $60,000,000 less than it imported, creating a negative balance.

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exam Other Question

Solve the following equation for x:

x^2 + 5 = 21

Express your answer(s) in both "simplified radical" form, and in decimal form.

I came up with x=4 and x=sqrt16. Would this be correct.
PROBLEM: THE QUANTITY y VARIES AS x AND INVERSELY AS z. IF y=15 WHEN x= 50 AND z= 10, FIND y WHEN x= 65 AND z= 5........

****PLEASE HELP ME LEARN HOW TO EVEN BEGIN THIS PROB