exam Maths Puzzle Numerical Ability

Can you help me find the value of this problem, f(x)=4x+2, f(-4)

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exam Other Question

Rose�s garden is in the shape of a trapezoid. If the height of the trapezoid
is 16 m, one base is 20 m, and the area is 224 m2, find the length of the other base. Describe a situation where you would round as indicated? 1.to the nearest whole? (?time), 2. to the nearest tenth? (?fractions), 3. to the nearest hundredth? (?equations)
thanks