exam Maths Puzzle Numerical Ability

A GARDENER MARKS OUT A NEW SECTION OF LAWN THAT IS SUPPOSED TO BE A RECTANGLE WITH SIDES OF LENGTH 15M AND 10M RESPECTIVELY. TO CHECK HE HAS MARKED OUT A RECTANGLE HE MEASURES THE LENGTH OF THE DIAGONAL. HOW LONG SHOULD THIS BE?

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exam Other Question

at the beginning of the Alay Lakad, Rizza and Angel are 30km apart. if they leave at the same time and walk in the same direction, rizza overtakes angel in 60 hours. if they walk towards to each other, they meet in 5 hours. what are their speed? In order to plot the graphs of the following functions, what do I do first? I am so lost!
f(x)=7^x
f(x)=4^x-3
f(x)=(1/5)^x
f(x)=log3x

Thanks for your help!