exam Maths Puzzle Numerical Ability

please, please, please! find f+g, f-g, fg, and f/g. {{{f(x)=sqrt(4-x^2)}}} and {{{g(x)=sqrt(1+x)}}} i know how to combine the functions, but i do not know how to slove the function

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How many cups of party mix that is 64% pretzels must be added to 84 cups of a party mix that is 43% pretzels to make a party that is 50% pretzles? Tickets for a concert were sold to adults for $3.00 and to students for $2.00. If the total receipts were 824.00 and twice as many adult tickets as student tickets were sold, then how many of each were sold?