Abus on a regular schedule takes 3  1⁄4hours to reach its destination. the express bus takes 2  1⁄2  hours to make the same trip. how much travel time can be saved by taking the express?  

How do you solve a question like this?

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

The graph is supposed to show f(x) = 3 sin (x/4+1) - 1/2. which of the following are correctly represented in the graph? select two of the following that apply.