exam Maths Puzzle Numerical Ability

If one month there is an increase of 50% and the next there is a decrease of 25% how much was the increase or decrease.

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exam Other Question

evaluate the function for the value specified.

f(x)=xsec.power-7x+10; find (a)f(0),(b)f(5), and (c)f(-2)

I am really confused on this one. Thanks please help me to divdie :

4x^3 + 3 by a - 1 and check

thank u