Lily swims a 100 meter race she swims the first half and 27.8 seconds she swims the second half and 30. 12 seconds about how long does it take lily to swim the whole race choose the best estimate

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

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?

Describe a situation where it would be beneficial to round decimals to the nearest dollar. explain why you would use rounding in that situation.