book Maths Puzzle Numerical Ability

Please help me with this question: Name the x-intercepts and the vertex of the graph of y=(x+3)(x-1). Then sketch the graph of the function.

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book Other Question

how many yards of material from a 24 yard length of cloth remains after 3 pieces each 31/2 yards long and 5 pieces each 2 1/4 long are removed/ A chemist has one solution that is 20% acid and a second that is 50% acid. How many gallons of each should be mixed together to get 10 gallons of a solution that is 30% acid?