exam Maths Puzzle Numerical Ability

In the number 7^1000, what is the digit in the units place?

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Ellipse help needed?

A semielliptic archway has a height of 20ft and a width of 50ft. Can a truck 14 ft wide and 10 ft wide drive under the archway without going into the other lane? I HAVE $1.00 IN MY POCKET IT IS ALL IN COINS.
TOTAL COINS IS 50.
I HAVE 50 COINS IN MY POCKET WHICH IS EQUAL TO $1.00. WHAT IS THE BREAK DOWN OF COINS THAT I HAVE? HOW MANY OF EACH ?