C varies inversely with D. If C is 50 when D is 11.5, find C when D is 20

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?