exam Maths Puzzle Numerical Ability

Buddy invested 15000. He put some money in at 4% and remainder in at 5%. At the end of the year he had $690 in interest. How much did he invest at 4% and how much did he invest at 5%?

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I do not have an Idea or how to start how to graph and solve this solution could you help me please thank you in advance

Solve and graph the solution set. x + 12 > 5 From 1990 to 1993, the number of truck registrations (in millions) in the united states can be approximated by the model R=0.29t^2+45 where t is the number of years since 1990. During which year were approximately 46.16 million trucks registered.