book Maths Puzzle Numerical Ability

Number problems.

You have at least $30 in change in your drawer, consisting of
dimes and quarters. Write an inequality that shows the different number of coins in your drawer.

Thank you!

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book Other Question

Could someone please explain how to do this problem and solve please?
(2x to the 4th power yz to the third power)squared
Also if anyone knows how to write out the fourt power I would really like to know.. Thank you
Write the function that has x intercepts
4, -2/5

Please help!