exam Maths Puzzle Numerical Ability

1. F(x)=3X+1

2. F(x)=-1/3X-2

3. Slope (-3,5), M=-1

4. Slope (3,0), m=4/3

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exam Other Question

In one year, Andrew earned the same interest from an investment at 8% as an investment at 12%. He had invested $1500 in the 8% than in the 12% account. How much did he invest in each account?

Please help! To whomever can assist, thank you...

How many years will it take $4000 to double itself if it is invested at 5% simple interest?