exam Maths Puzzle Numerical Ability

I need help on these two questions

1. Solve for x when [5x-7]=14

2. Multiply the complex numbers (4+3i)(6+i)

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exam Other Question

if one hand equals 4 inches, find the height in feet of a horse that is 16.2 hands`(1 ft= 12 inches) Could I get some help with the following problem: Graph the line that passes through the point (3,0) that has a slope of -2/3. Thanks