exam Maths Puzzle Numerical Ability

Sarah needs to borrow $1500 for her school tutition. She borrows the money on a six monthe short term note that charges simple interest. After 6 months, she owes $90.00 in interest. What is the simple interest rate being charged on this note?

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exam Other Question

find the equation of the line through the points (-2,4) parallel to the line
2x+7y=9

i tried solving for "y" but was not really sure if i was doing it right
or what to do after
-a/b=-2/7 Laura invested $2000, some at 8%,annual simple interestand the rest at 10% annual simple interest, giving her a total of $176 per year. How much did she invest at 8%?