exam Maths Puzzle Numerical Ability

I need to know what exactly i am asked to do for these problems. On step1 what am I supposed to put in the space where the dots are? on step 3 I recognize that pattern but I get st

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Mrs. centeno invested half of her money at 7 percent and half at 8 percent per year, her annual income from the two investment was 7,500.00 how much did she invest at each rate? Solve the following system of linear inequalities by graphing.
x - 2y  4
x  4
The first equation is greater than or equal to 4 and the second is less than or equal to 4.