book Maths Puzzle Numerical Ability

explain how the graph of y=a*f(x) can be transformed from the graph of y-f(x). Explain in words how "a" affects the graph and show examples using specific values and when a<0, a>1

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book Other Question

Kyle weighs twice as much as his younger sister Suzanne and 10 pounds less than his older sister Margaret. All together they weigh 90 pounds. How much does Margaret Weigh. Can anyone answer this?
There are two spinners, one is divided into thirds with green,
yellow and blue. The second spinner is divided into fourths with
blue, yellow, red and white.
find the theoretical probability of spinning blue on both.</PRE>