Which of these decimals is the greatest?

On Halloween Mr. Burke brought in 89 mini candy bars and 66 lollipops for his class of 31 students. How many total treats did he bring?

\(\dfrac{7}{8} ÷ \dfrac{9}{5} = ~?\)

Add:

\(1.728 + 0.9975 + 2.42 =\)

Rose correctly answered 70% of the spelling bee questions. If there were 220 questions total, how many did she answer incorrectly?

Multiply:

\(8.32 × 3.2 =\)

\(3\dfrac{2}{5} + 1\dfrac{4}{7} =~?\)

If \(n\) is a positive integer divisible by \(7\), and if \(n \lt 70\), what is the greatest possible value of \(n\)?

What is the value of \(x\) in the triangle below?

Sam wants to cover his garden patio with brick tiles. His patio measures 15 feet by 20 feet. Each tile is 1 foot × 1 foot and costs $2. How much money will Sam spend if he buys exactly enough tiles to cover his patio?