exam Maths Puzzle Numerical Ability

Hi can you help me with this math problem?

Graph the function

7.) f(x)=3(x-4)

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exam Other Question

Why is 3x^0 = 3 and (3x)^0 = 1. help solve.

earned $12,000 last year. He invested part at 3% simple interest and the rest at 4%. in one year, he earned a total of 440.00 in interest. How much did he invest at