What is the least common denominator for 3/16 and 11/24

Aaron paid $9.75 for markers that cost $0.75 each. he bought 4 times as many pencils for $0.35 each. how much did aaron pay for pencils?

Stephen bought 85 shares of united rotators at $6.34 each, 110 shares of dowc beverage co. at $13.13 apiece, and 133 shares of esti transport at $7.10 each. if stephen’s broker collects a commission of $12.50 for every ten shares bought or sold, how much did stephen spend in total, to the nearest dollar?

What is the coefficient in the expression 7x + 14