Estimating products of fractions how do you figure 3/8 × 15

Answer this question! 30 points and brainliest! only if you know the answer.

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer