exam Maths Puzzle Numerical Ability

Carl is a years old. His sister Jenny is six more than twice his age. What is the average of their ages?

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exam Other Question

I submitted my question earlier, but need to have an answer in the next 20 minutes. My question is as follows, and is not out of textbook: What are the intercepts and coordinates of x,y, and the domain from the equation f(x) = 4x^5 +3x^4 - 2x^2 + 7? Rewrite the equation 2x – 3y = –6 as a function of x

Can someone please show me how to do this.

thanks

Jessica