exam Maths Puzzle Numerical Ability

Given that (3x-a)(x-7)=3x^3-32x^2+81x-70, determine the value of a.

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exam Other Question

the perimeter of rectangle 240 cm. its length is decreased by 10% & its breadth increased by 20 we get the same perimeter find the length & breadth of rectangle I am working on exponentaial functions and graphing. Can you help me plot the graph of the following functions?
1. f(x)=6x
2. f(x)=(1/2)^x