book Maths Puzzle Numerical Ability

how do you identify funktions?



can you show me how to do this problem

the rule: evaluate the function f(x)=3x-10 for the given value of the variable.
x=-2
can you show me how to do it please!!!

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book Other Question
the chocolate factory Blends it double-dark-chocolate fudge, which is 35% fat, with its peanut butter fudge, which is 25% fat, to obtain double-dark -peanut fudge, which is 29%fat. Can someone help solve this problem for me?

What is 48.3% of 1,500?
Can you show me how you get your answer?
Thanks,
Sher