book Maths Puzzle Numerical Ability

q prob # 15 out of the elementry algebra math 100a book ////show that each of the following numbers is a rational number by expressing it as a fraction with an integer numerator and a nonzero integer denominator 6,-9,-7/8,3 1/2,-03,2.83

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1. A baseball coach is determining the batting team for the team. The team has 9 players, but the coach does not want the picher to be one of the first four to bat. How many battin Monica invested PHP 200,000 at a certain interest rate and PHP 300,000 at a rate 2/3 as high. If annual income from the two investments is PHP 36,000, find the interest rate of each investment.