exam Maths Puzzle Numerical Ability

How many license plates can be made of the form DDDLLLL, where D is a digit 0,......9 and L is a letter A,....z? What if symbols can be used only once each?

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Could someone please help me with this problem: 7x = 3
My book says solve the exponential equation algebraically.Then check using a graphing calculator.
Thank you in advance for all your help. Elle J Use a table of values to graph f(x) and g(x)on the same set of axes. Graphs should be neatly labelled

a) f(x) = 3 to the power of x and g(x) = (1/3)to the power of x