book Maths Puzzle Numerical Ability

Im supposed to write this in interval notation, but I do not know how.

2x^2-13x+15<(or equal to)0

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book Other Question

The sum of two consecquitive positive even numbers is 340. find the numbers
Thank you A box contains $17.70 in nickels, dimes, and quarters. The number of dimes is 8 less than twice the number of nickels. The number of quarters is 2 more than the sum of the number of nickels and dimes. How many coins of each kind are there in the box?