exam Maths Puzzle Numerical Ability

Find the following product.
(0.3x + 0.2) (0.3x - 0.2)

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exam Other Question

A trapezoid has one base that measures 5 inches and its other base measures 3 inches. What is the area of the trapezoid if its height measures 4 inches? please help me with this problem it will be very appreciated

Find all zeros of the function
f(x)=-2(3x+2)(8x+1)(9x-5)